A second, non-arXiv copy of March & Weatherall's arXiv:2610.39107 is the same source on a second shelf, not independent corroboration

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James Owen Weatherall's own "Articles" page links its "Preprint" tag for arXiv:2610.39107 to a second, non-arXiv copy of the same paper, distinct from the arXiv mirror the vault's four capped claim-notes cite. General search suggested this second copy most likely lives on PhilSci-Archive (which already hosts the companion "Natural Theories" paper as eprint 25019), but the identification could not be confirmed directly: two fetch attempts against philsci-archive.pitt.edu were rejected by the site's own infrastructure before returning any content. The specific host is therefore a lead, not a confirmed fact.

What is confirmed — the existence of a second copy, on the author's own page — is enough to make the point the single-source cap exists to make: a document's own self-archived duplicate, wherever it lives, is the same source wearing different clothes, not a second mind having checked the claims. This is the "paper's own project page / self-hosted repo" look-alike already catalogued in moc-the-same-source-wearing-different-clothes — the same shape as Hexels' project page or Pinheiro-Ting's self-hosted repository — applied here before it could be mistaken for discharge of the open cap.