Case No. 260·Italy
1933·Vergiate / Magenta, Lombardy, Italy
Italy.Cabinet RS/33 · Magenta
According to documents circulated since 2000 by Italian ufologists Roberto Pinotti and Alfredo Lissoni, on 13 June 1933 an unconventional craft allegedly crashed in northern Italy, and Mussolini supposedly created a secret cabinet, 'RS/33', under Guglielmo Marconi, to study it, storing the remains in SIAI Marchetti hangars at Vergiate. It would be the 'first Roswell', 14 years earlier. Without verifiable archival originals.
Year
1933
Tier
B
Probability
14%
Category
Incident
Limited evidence: single-witness, local or without primary verification. Three independent axes: the «tier» measures the strength of the evidence; the «probability» estimates how genuinely unexplained the case is —a natural phenomenon can remain unexplained, so it does not equal «non-prosaic»—; and the partition of explanations (below) says what it most plausibly was. So a well-documented case can have a possible hoax as its most plausible cause, and a Tier B is not, for that reason, a hoax.
Primary documents · viewer

Context · Magenta (Lombardy, Italy)
Magenta-municipio1.jpg · Wikimedia Commons · CC BY-SA 3.0 · open original
Part 01
The night in question
The Cabinet RS/33 case —also known as the 'Magenta case'— is the claim that Italy had a crashed-craft retrieval fourteen years before Roswell. By the narrative, on 13 June 1933 an unconventional object crashed or landed in northern Italy, in an area variably attributed to Magenta (Lombardy) or the vicinity of Vergiate, near Lake Maggiore. Benito Mussolini's regime supposedly imposed an information blackout and created a secret intelligence unit to study the event: the Gabinetto RS/33 —'RS' for Ricerche Speciali (Special Researches) and '33' for the year 1933— allegedly placed under the direction of physics Nobel laureate Guglielmo Marconi. The remains were said to be stored in the hangars of the SIAI Marchetti aircraft factory, at Vergiate.
The story comes not from open official archives but from a set of documents that Italian researchers Roberto Pinotti and Alfredo Lissoni began publicizing from the year 2000. By their account, they received those 'original secret documents' —telegrams, silence orders, a sketch of the craft— from an anonymous source who claimed to have inherited them from a relative tied to the Fascist regime. That is, the entire documentary basis traces back to a single unidentified source.
The assessment of authenticity is therefore the heart of the case. A forensic expert examined one of the documents, dated 1936, and concluded that the paper and ink were consistent with that period, which its defenders cite as support. However, period paper does not prove the content: a document can be materially old and still false or misinterpreted. No independent archive has corroborated the existence of Cabinet RS/33, there are no accessible originals accepted by academic historians, and the single, anonymous provenance precludes verification. The historiographic consensus holds the case as unproven, while its promoters periodically present it —even to international media— as the first documented crash-retrieval in history.
Part 02
Why this case moved the needle
The RS/33 case matters to the corpus as the European, pre-Roswell equivalent of the craft-retrieval narrative, and as a test case on the value —and limits— of documentary evidence of single provenance. Its interest is that it stresses a crucial distinction the corpus constantly practices: the difference between the material authenticity of a paper and the truth of what that paper asserts. That the ink is from the 1930s does not make a 1933 crash real; it only shifts the question to who wrote the document, with what intent, and why it never appeared in any institutional archive.
That is why the posterior loads onto the mundane/natural narrative in its fabrication variant, with an acknowledged portion for nohumano_encubierto and a bounded indeterminacy. The case's structure reproduces almost point for point that of Aztec 1948: an extraordinary claim of state retrieval resting on a single unverifiable source, with no accepted archival originals or independent corroboration. The mass granted to nohumano_encubierto does not reward the account's veracity, but acknowledges that its content IS, by definition, that narrative, and that the opacity of the Fascist regime's archives prevents closing an absolute negative. Indeterminacy captures that documentary margin. In the corpus, RS/33 is the case that teaches one to audit the chain of custody before the content: the reminder that a 'secret' document released through an unauthorized channel and of single origin is a hypothesis about its own provenance before it is proof about the sky of 1933.
Part 03
What's left on paper
Documented evidence
- Documents ('telegrams', silence orders, a sketch of the craft) circulated by Roberto Pinotti and Alfredo Lissoni since 2000
- Narrative: crash of 13 June 1933; secret Cabinet RS/33 under Guglielmo Marconi; remains at SIAI Marchetti (Vergiate)
- Single, anonymous provenance (a relative tied to the Fascist regime)
- Forensic analysis of a 1936 document: paper and ink consistent with the period (does not prove the content)
- Absence of verifiable archival originals and of corroboration by academic historians
- Structure paralleling the Aztec case (1948): state retrieval based on a single unverifiable source
Patterns it exhibits (1)
Location
Vergiate / Magenta, Lombardy, Italy · 45.72°, 8.69°
Distribution of explanations
This case is classified among the model's hypotheses: the bar splits 100% by how much each explanation weighs (the uncertainty is spread across the hypotheses the case supports). Summed across the corpus they produce the comparable partition. It is a different question from the Probability above: that one estimates how likely the case is a genuinely unexplained phenomenon; this one splits which the explanation would be.
Modal hypothesis: Possible hoax 86% · sums to 100%
Structured analytical judgment, not a calibrated frequency. Forced classification: the mass the evidence cannot assign is spread across the hypotheses the case does support.
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