I think the OP is talking about undeliverable mail, not lost mail. IOW, the quilt fell out of the box along the way and has no addresses or anything attached to it any longer. If mail is 'lost', they can't destroy it because they do not have it...it's lost in the system somewhere.
Make sure your package is secure, both sender and receiver names and addresses are clearly printed and covered with tape on the inside and the outside of the package, track and insure as you see fit, and anything you mail should eventually find it's way to either the intended party or back to you.