Cash worked every time. And it was never interrupted. One time i did a deal and put the dough in a birthday card and said happy birthday,
Customs opened and taped it back up with the cash intact. I think its a lot tricker to steal from the post office than it used to be, Except for that time they stole the hash i sent to a friend. Now I vac seal EVERYTHING.
The hash was sent in Canada to a Canadian legally.
I am retired and that gave me something to do for a day or 2...the post office does ensure my stuff is delivered now