I've been somewhat away from the Boards a few days and haven't really kept up as well as I should. I did read something the other day on, I think, either the FDA, DEA or Customs sites that says if they seize a package they are REQUIRED to send a notice to the recipient. Makes sense to me--otherwise the PO (quasi private but Gov nonetheless) could just deliver whatever mail they decided to deliver. It may be that in times of security they want a signature to prove delivery of the notice.

Personal opinion, I'd either do nothing or go to the PO and say refused--probably leaning on doing nothing. I surely would not sign and accept--unless I were expecting something of great value that they wanted me to declare and pay taxes on! (I started to say "antiquities" but they are exempt anyway.)

TC&GL all.