completely agree louisxiii, if its made it to your house then its made it through, unless youve ordered a ridiculous amount of seeds at once then customs arent going to open it, see a few beans (IF they see it, ive heard cannesur are so stealth beans have been tossed in the trash accidentally!) and send them to you so they can track you, stake you out and bust you for MAYBE 5 plants (if you got 5 females, no hermies, no deaths etc) imagine the cost to do that versus the worth of the bust itself? nup not gonna happen, they just take em, send you a letter and add your name to the list...
i completely understand the need for caution when ordering seeds, i had a lot of worries myself, but i would focus more on where you order them from rather then whats going to happen to them when they get sent, deal with a reputable company (to make sure your seeds get sent in the first place) with good stealth techniques. do everything you can to increase your chances of getting your beans!