Online chastity and self locking discussion

I’m curious if there are any small locking boxes available that can be secured with a combination lock, where the lock isn’t integrated directly into the box’s closing panel (like how it works on a safe). By this I mean something featuring a small hole that lines up with part of the box to keep it shut. I’ve included an example photo showing the layout. Basically, what I’m after is about 20 centimeters wide at most and opaque. I didn’t anticipate such a straightforward item being so hard to locate. The attached image gives a rough idea of my requirements.

I recently experimented with a mini safe, but unfortunately I tend to overlook things occasionally, which resulted in all the keys ending up trapped inside the locked safe. Luckily it had small ventilation-style holes that I managed to widen using pliers and scissors so I could retrieve at least one key.

Perhaps I’m just tired from lack of sleep, but I don’t quite see why you’re seeking this specific solution instead of a small combination safe. Is it about how easy it is to use bolt cutters?