I hate hearing people talk about shit they have no idea about.
Noone can use a fucking seized package to search your place of residence unless you are already in some type of legal toruble(IE: Probation). If your package is seized then you get a seizure letter and it is very clear that the letter is form the US(or whatever)government and that you DO NOT NEED TO FOLLOW THE DIRECTIONS TO GET YOUR PACKAGE.
However, if you have a letter saying hey man, we dropped your package off but you weren't here and it's registered so you gotta come sign for it, then you just go to the post office and sign for it.
The government isn't fucking all mighty and a lot of times it's pretty easy to weasel your way around shit.
lol so do i ^

you must not have read all the replies that state the exact same thing you said. but your wrong about the cant part. they can they just dont at least not with internationals.