Really sorry to hear that, if you live in an apartment complex the thief probably lives around the corner.
It is a faderal crime messing with someone else's mail.
You should keep a loaded 12 gauge next to your front door living in Jersey.
Whoever delivered your package will surely right the situation. The only matter is how long it will take them to do it. Also, ask your closest neighbors if it was left with them and check with your front office.