Its happened to me. On bulk lots where an auction house would show a small % of cards.
now & then some good stuff was in there. Buried treasure if you will.
I won an Eddie Stanky lot from his estate via Hunts auction
A stack of cards were scanned, '50's & '60's Topps w/ a few Bowmans
There was no scan nor mention of a Hunter's weiner card.
Had a bunch slabbed & pedigreed from SGC & sold the Hunter's for more then the entire lot.