What USPS DOES NOT tell you is their insurance is based upon the article value not replacement value. I emphasized their language. If it was new you have good basis for replacement with receipt of proof of purchase. If item is considered "used", they will pro rate it unless you can validate the used value somehow.
Scroll down to "proof of value".
What is proof of value?
Proof of value proves an item's value or any required repair costs.
Either the mailer or the addressee must submit acceptable proof to establish the cost or value of the merchandise at the time it was mailed. If you are filing your claim online, evidence may be uploaded or mailed in with your claim. Examples are:
- A sales receipt, paid invoice or bill of sale, or statement of value from a reputable dealer.
- Paid repair bills; if the claim is for partial damage, estimates of repair costs or appraisals from a reputable dealer. Repair costs may not exceed the original purchase price.
- Receipt or invoice for the costs incurred to buy a surety bond required to reissue a lost item.
- Receipt or invoice of costs incurred for the reconstruction of non-negotiable documents.
- A copy of a credit card statement or other documentation indicating the amount paid.
- For Internet transactions conducted through a Web-based payment network that offers payment services through a stored value account, provide a computer printout of the online transaction identifying the purchaser and seller, price paid, date of transaction, description of item purchased, and assurance that the transaction status is completed. The printout must clearly identify the Web-based payment network provider through which the Internet transaction was conducted.