I'm not sure what exactly you are looking for...... but try this link as there are 5 pages of shifter issues listed within, so maybe your question is answered there?
B-J auction fee is 10% added to the buyer's bid, and 10% deducted from the seller's sold figure
If buyer is a private citizen (not a dealer) they also pay sales tax if in AZ auction. Not sure about
how other states look at auction sales?