This is why I have rarely bought collections at Auction, focusing instead on key sets or singles I need. I absolutely despise finding problems in eBay
and other "blind" purchases that could have easily been described, and frankly it's become a matter of great displeasure over the past year or two. Perhaps it's pretty obvious from my posts and I definitely feel your pain.
The only exceptions re buying collections or lots have been some MNH/UMM KGVI country collections from Corbitt's which were amazing. I did buy one net priced collection of Jamaica from Apfelbaums only because there was a rare perf they didn't see that was worth 15 or 20 times what I paid for the entire lot.