If you can remember, try to ask for pictures of the packaging or new pictures of the item prior to packaging as pictures may be old. As a seller you should always try to take pictures of the packaging, and the item just prior to sealing the package so you have a documented record of what you are sending out and the condition everything is in. Digital photos will have a date and time stamped into their digital signature/properties as well, so that’s good evidence (sure it can be manipulated but the more evidence the better).
Now I cannot say this is the same with UPS or Fed-Ex (I’m sure it is as I’ve had to sign for packages delivered by each of them before), but with the USPS insurance only covers everything up until the item is left at the buyer’s residence/destination. That means if a package is left there but winds up being stolen from the doorstep or stairs or whatnot, or if it’s left at the wrong residence but marked as yours, insurance does not cover that. Sellers should make sure to get signature confirmation; with signature confirmation you have added insurance and a documented record of the person that signed for the package. It assures the buyer will (most likely) receive the package, and the seller gets a bit of extra insurance that a scam cannot be pulled in saying the package never arrived or something similar. It’s only three extra dollars at my post office, so it’s worth the money unless you’re sending out something disposable to you at $30 or less and you are low on cash at the time.
Oh and as a seller always make sure to take a picture of the postal receipt and if you want some extra insurance as a buyer, ask for a picture of the postal receipt.

