eBay

I recently sold some comics to a store that contacted me about the condition of the comics. He sent me some pictures that actually confirm the grade I gave him and told him that they are still acceptable in the grade on NM (slight bunting, stress lin...

What happens if a buyer claims he didn't receive the package but shipping says it was delivered to his mailbox? The guy has filed a grievance against me. I'll contact the post office, but what else can I do?