Bought this for my son who was concerned his sister may have been dipping into his cookie-jar--literally, his old bank was an old plastic animal cracker tub. His sister does not know he bought it and was a bit of Mission Impossible to keep her from seeing it.
When looking at it on his book shelf, it fits right in with other books. It is not the most "authentic" looking book, especially if sitting out by itself. However, when surrounded by other books, I would imagine only an experienced eye is really going to pick it out. As far as locking stuff up, I am sure with a screwdriver I could pop it open in about 10 to 15 minutes. However, he's not hiding state-secrets or the Hope Diamond; he is just trying to keep his sister out. Therefor, if you know what you're getting, it is 5 stars.