I'm not 100% sure that the payment is secure even at this point. Lots of scams that could be used for scammers to get the bass and their cash back.
Be careful.
Not sure if will work...
My brother works in Antiques - one of "the tricks of the trade" is to use a wax crayon to fill any dents/chips. Fill then remove any excess with a damp rag and a steam iron.