Ready to give up on shipping parts (or anything)...

You can go on the USPS web site and order Priority Mail boxes and envelopes and have them sent to your home or work address at absolutely no cost. You can also use the USPS site to purchase and print a shipping label. Pack your stuff up, tape the label on with clear packing tape, and let your postal carrier pick it up next time they come to your address. You never have to go to the post office.

This is what I do. Free USPS packaging, no issues. Also, sign up for a USPS account so you can print your own labels. Makes drop off sooooo easy!