I thought that the inside the mailbox was property of USPS (federal) and off limits to carriers, neighborhood lawnmen/offers, etc.
What do I know though... Glad it was safe and chilly for you to heat up with fun clock demanding apps.
For a
mail box, that's true. But the SP2 wasn't
mailed. No, the buyer paid to have the purchase transported by a "public carrier" (UPS, FedEx, et. al.) government-licensed to deliver the object to the buyer. Unless instructed otherwise by the purchaser, the delivery of the item is supposed to be acknowledged by signature of an individual authorized to receive the package, certainly
not abandoned on the doorstep.
Yes, I know that too often happens, but it's foolish. The carrier is responsible for the item during transport, and should the package "disappear" from where it was dropped unattended, without that signature or proof of delivery, the carrier will very likely be liable for the full cost of the item.
Even if the merchandise isn't stolen (a good thing of course), by all means, such irresponsible behavior is worth complaining about.