I'm really enjoying these responses. Some are not getting my question, but that's fine - that has led to additional interesting discussions: I'm actually sitting on information about two items where the auction is long-dead and they may never again be available.
I know most collectors will let AH's know if there is a mistake, and will post about such mistakes...so long as they aren't personally planning to bid on it
. If the consignor knew a mistake was being made, they should say something to the AH. If not, then I'm of the same opinion as Al.
As far as sharing information goes - I have no problem with doing so. I like researching, writing and discussing too much to 'not play' just to get better deals in the future.