Pulled fresh from a pack and inserted directly into a penny sleeve.

Ships via eBay standard envelope well-protected, which requires an additional “do not machine” stamp/charge at my local post office.

A non-machinable stamp likely prevents the tracking that typically comes with eBay standard envelope. I’ve had too many cards returned to me if I don’t put the non-machinable stamp on them.

You can select USPS Ground Advantage if you want reliable tracking.