Curious to know - is this the norm?
Awhile back I bought a bunch of stuff at Dutch Country Auction. Varied lots of whatever grabbed me. Now this was 3 years ago and I still have a bunch left to keep me busy. In one of the lots is a put together small 3 ring binder of world stamps of "huge catalog value". Total stamps in this binder, maybe 200 - guessing. Like this:

-Included and listed as Monserrat Sc 95a - catalog value 16.00 has a 2019 listed value as 1.00
-included and listed as Mexico Sc O167 cat value 30.00 is really O181a 2019 value 2.15
-included and listed as Myanmar Sc342 cat value 22.50 is 2019 Scott value of 2.75
-included and listed as Myanmar Sc 341 cat value 15.00 is 2019 Scott value of 1.75
I also know that in going through the binder I have come across other stamps mislabeled and with wildly different catalog values between my 2019 catalog values and what's listed on the sheets.
Now the Myanmar stamps may not be a good example seeing as there is a warning for values listed for this set in the Scott listing.
So, how do auction houses handle this huge difference in what is listed on the item vs catalog pricing? Are these differences "normal"? Maybe the listed catalog values were what they were when the previous owner put the collection together? Guessing not though as the differences are pretty big...
They (Auction house) obviously dont check each and every item. There was no disclaimer other than, from what I recall, that if you dont return items, sale final. Do they thrown a number on it and call it a day?
I have not narrowed down the exact lot so I cannot say for sure how much I paid. I do now that I am not looking to make money - but do find this huge discrepancy curious. Maybe the "catalog" value was 2500 total and I only paid 200 for this stuff thrown in with 1,000's of other stamps???
Is this the norm?