my coworker keeps stealing my snacks

so i work at a startup and we all got these weird vending machines that are basically like fridge combos where u can buy snacks n drinks. but the thing is, the company has been struggling to get them to actually stock stuff in there. so when someone does put in some snacks or whatever, it becomes this big deal for everyone cus theres always a shortage of everything. anyway, i brought in these really cool energy bars one day that are like super tasty n healthy but kinda hard to find, and the first thing i do is i put them in my vending machine. now, im not saying i hide them or anything, but i dont exactly announce where theyre at cuz honestly i want to keep em for myself. but yesterday at lunch when i go check on them, there are none left! i ask around and everyone says they havent touched it n no one else has put snacks in the machine. so clearly someone took mine! im not sure if im being super paranoid here or what but this is driving me nuts cus these bars r really good n i dont wanna share them with ppl who dont even know what they are. so am i totally overreacting or should i talk to my boss about this? what would u guys do?