The package is trackable (if you print the label online) though no signature is required on delivery. An interesting tidbit, any package over a pound is automatically considered priority mail even if you want to do it first class. Both are transported together and it is not treated any differently than regular mail. The 2-3 day delivery timeline is an estimate and not a guarantee, you’ll need Express Mail for a money-back guarantee

SIG CONF:Over $250 always use Signature Confirmation (and DC!)! If you don't there are some dishonest buyers out there that will see you sent it non-signature and they will file claim with Paypal saying "I didnt receive the item" and they will win.