The fee will just make a red flag. Hopefully you will take a pic of what you are sending once it is boxed up and then email to those who you are sending to and see if they were opened and riffled threw. It is supposed to be illegal. but that doesn't stop the post office. My uncle sent my bro some equipment and powders and chemicals to make rubber. the post office not only opened up the package but dumped out the packets of powders and chemicals. they are probably still cleaning up the mess that they made. hehe jokes on them I guess.