Super Mario Mystery threaded Box

I came up with this box design when I was thinking about a new dog tag for my Jack Russell. I figured that a 3D model would be much cooler and since I like Super Mario I thought about doing it following the Mistery box design. I also found that it works very well as a keychain for my car keys.
The box has an internal threaded hole where you can save treats for your dog, waste bags, or pretty much anything you can think of that can fit in there.

I modified the TOP part of the box so one has a ring at the top to hook it to a split ring, while the other TOP model doesn't have that ring.

I designed it entirely using Tinkercad

No supports needed

You will need to print 4 copies of the question mark, one for every side face of the cube. Once printed glue them in the corresponding slots