The French Wikipedia page doesn't talk about it, but the quoted text from the English Wikipedia page involving an iron bird (and not a bronze owl) is accurate. Here's the official report of finding it: https://cdn.shopify.com/s/files/1/0511/4586/7430/files/pv.co... (liked from https://editions-chouettedor.com/pages/documents-officiels).
_notreallyme_|1 year ago
What it says it that the statue should have been in bronze, but is instead in "ferrous metal" and must have been replaced around september 2005.
Anyway, the idea was that the golden one was not buried, only a "pass-out" one.