I'm having a buyer return an item. How do I find out which address they are mailing it to?

Level 1
So I put the wrong shipping label on a package and the buyer is sending it back. Problem is right now I'm inbetween residences and all of my mail is going to a PO box. The buyer said he's uncertain where it's going because all he received from OfferUp was a barcode? How can I find out where this package will be sent?
New Member
If u followed all of the procedures for a change of address or filled out ur forms for ur P.O. Box you should get a notification in your box that u have I package to be picked up I would think?!?!