I will just slip it in a plastic sleeve, wrap in bubble wrap, and put in a flat rate box. $5 for shipping Sent from my SCH-I545 using Tapatalk
Actually, $5.80 for a flat-rate box. Insurance limit is $50. If you want to insure for $100, the $50 doesn't count toward the fees, and you can't "add" another $50 insurance. You start over. Clever, those USPS guys.
I found this, but no time to research further: o. Except for Registered Mail, the maximum indemnity for negotiable items (defined as instruments that can be converted to cash without resort to forgery), currency, or bullion, is $15.00. You cannot insure bullion unless sent by Registered mail, plus insurance. See https://bitcointalk.org/index.php?topic=111960.0