I've heard of LSD being shipped/packaged several different ways and some do involve more than just an envelope. Nonetheless, you should be fine - even if you get a knock, there's no way to prove you yourself ordered it, so just be calm, don't talk to LE, and if necessary, make sure your place is pretty clean just in case. I don't think you'll have them busting down your door for a small order of LSD though. Also, you could always consider ordering LSD from a domestic source -- you avoid at least one issue (customs) that way. Hang tight though - you may not get your order, but I also doubt that you'll have any problems with LE.