I sold an item and shipped with signature confirmation. It was out for delivery yesterday morning and the tracking never updated. Now it says "awaiting delivery scan."
From my experience with USPS, this probably means it was delivered and never scanned. This has only happened to me once before and the buyer was honest and left me positive feedback so I know they received it.
I believe the advice here is usually against contacting the buyer (let sleeping dogs lie), but should I contact USPS? If it was delivered already I know I'll never get a delivery scan online, but perhaps inquiring could make something happen?