Each seed is treated as 1 plant...so yea you could be busted....
Fed Ex people are not DEA officers. Does anyone believe that a Fed Ex location will have DEA officers, or even local cops, waiting around indefinitely in hopes that someone will show up to claim a few beans? If you go and if things seem odd, like people are staring at you and guys in Men in Black suits are hanging around just ask where the package was sent from and say it must be a mistake because I never ordered anything from there and walk. They will be returned to the sender and then you work with them to have them reshipped another way and to some location you feel safer with, like a friend who does not grow or some other safe address.
If you never take possession of the beans you cannot be arrested for possession of beans.
Before I had a rural route address and mailbox my seed orders were always sent to my P.O. Box and back then seed sellers sent them registered so they knew if you took possession of them or not so you couldn't claim you never received your beans and ask for them to be resent. I signed for God only knows how many packs of seeds and there were never any officers of any type waiting to bust me.
Once your package clears U.S. Customs there is about a 99.99999999999% chance that you are in no danger at all in relation to your order. The only way the post office or Fed Ex or any other shipper would ever discover what is in your package is if it were accidentally torn open by some conveyor belt accident or something and the beans fell out on the floor.
I really think you are to high strung and to paranoid to grow. Don't pick them up, let them be sent back and try to get a refund and if you have to toke, purchase your herb from someone who has not only grown a pair but also grew hair on them and isn't frightened of things that go bump in the night.