What I've heard: Putting a shit tonne of PB in a freezer bag, putting your oz in that bag, and then syran wrapping it and then putting it on like 3 day USPS (Next day air they scan or something I heard and the United States Postal Service has less strict means) with no return address and the recipient should be your first name but something like a wrong last name so there is always denyability (sp.)
This is what I've heard from just reading around this forum