This is an expensive option but it does work. If there is a UPS store somewhere nearby your new town, you could rent a mailbox, then ship the boxes using UPS to the store before you move. I have left packages that I needed to pick up for a week so you can go get them when you have a chance. Regardless, you need to get the stash out of your house before things are getting packed up; otherwise, you may get caught. UPS store is where I get everything shipped without my wife becoming aware. It has worked quite well so far - 3 years. I guess I am devious.

Sandi