If the item is insured, the recipient (who didn't actually receive it) can sign a document that they did not receive it and the sender can file a claim for the value insured.
At least with this being an electronic item, ATT probably has the tracking number so if somebody stole it and goes to use it, it will be tracked to them. I hope nobody stole it. Maybe it will end up that it was delivered to the wrong house or something. If you know your neighbors you can check around, or even if not.
I recently had a UPS parcel that went to a neighbor's house two doors down. It was a new driver who was not familiar and instead of looking at the house numbers on the houses (argh!), he saw that the house next to mine had an address 10 numbers off and decided mine was on the opposite side of him. I don't know how he managed not to see the address that was on the front of their house, right above where he laid the package on their porch but - whatever. After talking to UPS a couple times we figured it out and I went and got it.