Maybe I have misunderstood something you have said and I am posting this in error, but I’m not sure the 863 movement is the only evidence to identify a 3592 over a 3572.
Here is a 3572 with the 863 movement and an extract. Production date of August 1996.
https://omegaforums.net/threads/199...572-50-tritium-dial-sapphire-caseback.161764/
For the OP- you mention the listing comes with the original warranty card. It is possible the seller typed the incorrect reference in error. If the listing doesn’t show the card in its entirety, revealing the reference, you can always ask for a photo of that, which would resolve this.