re: usps insurance. remember to keep all your receipts. Even though the nice clerk will insure your package for whatever you say, you can only collect for whatever you have receipts. You cannot collect anything for your time.
http://pe.usps.com/text/dmm300/609.htm#1097244
section 4.3 item ag.
Non Payable: Personal Time used to make hobby, craft, or similar handmade items.