My partner at the time had and loved one of these and then lost it, so I bought 8 of them for like $7 each from a store in the UK. When it arrived it had all this official government tape on it and a note that it had been opened. I forget what the tape/note said but it was not obvious which agency did the opening. Not so long after that I had something else totally innocuous (literally a postcard sized cardboard envelope with a sticker in it) opened by Customs and Border Patrol and that was well labeled as such.
I guess for IED reasons they were interested but now I'm paranoid I'm on some list.
edit: oh and I should say I got 8 to have a variety of color options, they were a great gift and after shipping it was only like $80. Highly recommend, one of them would match any outfit. Kind of fun to watch them all drift variably over several months too.