A suggestion for your buyer...repairing that tip over damage would be pretty easy with a rivet gun and a sandblaster. Drill out those rivets then straighten out the band. Mask off the rest of the muffler with electrical tape (sand bounces off rubber surfaces) and blast that end cap and the band. New rivets are available from any well stocked auto parts store. The sand blasting might not completely smooth out deep gouges but the shallow scrapes would disappear and the deep ones would look 99% better.