The seeds come in a plain white envelope like any other letter. I have also read that if it does get snatched by Customs, they forward a letter to the address and no further action is taken. Besides, think of the sheer volume of plain white envelopes that come into the USA every day, they can't possibly scan every envelope. If I am not mistaken, I don't think that seeds can be smelled by dog's or whatever. All I know is that they worked for me......thank God