This shop sells factory 2nd and refurbished instruments that come directly "...from the refurbishing center from the manufacturer." They have either "USED" or "2ND" impressed on the back of the headstock. Also, "To prevent unauthorized warrantee claims on the new, used, Factory 2nd, refurbished guitars, our refurbishing center will partially remove the original serial number from the instrument." I can't see the need for obliterating any part of the serial number since the factory did the refurb. Seems like an easy way to legitimize stolen instruments. Is this normal procedure for refurbs and 2nds?