FTFY. as a seller once it shows an acceptance scan, i'm outie 5000. talk to mr postman if you see its having problems.Agree with Crosshairs.
Once package is in proven possession of the carrier, it's not the seller's problem. Sellers on these forums are not Amazon.com like someone you buy off Craigslist is not Walmart.
As a buyer and seller on these forums, if I'm buying something super valuable (like an expensive GPU), I make sure the address I choose is a secure location (in my case, my work office). If you're buying an $800 second hand GPU and it gets picked up by a thief, then that's a very expensive lesson.