Another way to mask potential smell problems is to bag the bud, then cover in plastic wrap, then spray with mace. Then wrap again, and cover with isopropyl alcohol, then wrap again, etc. I do this when I go through the airport, as something like peanut butter just isn't practical.

Coffee grounds supposedly work too.

Since the smell isn't impossible to mask, I think your only potential problem could be the package going through an xray.

If I were you, I would just drop some in a mailbox, with no return address. I guess I don't have enough weight around to take chances with a qp, anyway, Good Luck!