The Spy Bolt hidden storage safe has been existence for decades now, actually, it was developed by the KGB during the cold war to hide items. Now it can be purchased by anyone to hide money, film, a microSD or other small items of value. Plus it’s completely waterproof as well! The reality is, no one if going to look at a bolt and think there’s something suspicious about it, nor do I think it would register with most security people. Now, the real question is, what else can we hollow out to hide things in??