El Supremo covers it. I would only add a suggestion that you check to see if the receiver is peened out where the hammer strikes it--that can happen if it is dry-fired too much. Too much dry firing can create a small lump in the breech end of the barrel that is enough to prevent a case from chambering. Also, check the buttstock again for cracks--they are common and tough to fix.
I realize the inspection is "day of" for the auction, but if you arrived early and posted a few photos here, you might get some useful feedback before bidding-time. Photos of buttstock, top and sides of receiver, and rear sight area would capture most of what is needed for evaluation.