USPS Package returned "NO SUCH NUMBER"

[shoptalkid]

So an inexpensive item I sold almost 2 weeks ago just came back with the yellow USPS sticker that reads: " Return to sender No such number. Unable to forward" .    I'm not cancelling for "problem with buyers address"  because I made that mistake before and the buyer got a full refund because I offer free shipping.  

I double-checked the address in Paypal and that's where I mailed it.   Tried googling and it showed a picture of a park!!!!   Should I just wait for the buyer to contact me or message them with their alternatives (pay to have it re-shipped or receive a refund less what it cost to ship and fees).   

[southern*sweet*tea]

Cancel using problem with buyer's address. You offered free shipping, so they're going to get a full refund anyway. Add them to your block list.

Done.

You can't keep the buyer's money if you have the item.

[sam9876]

Funny.