This box includes an internal card holder that fits the original deck plus Unnatural Axe expansion. There's room on either side for game accessories (we use dice as level counters). 

The lid includes a subtle invitation to kick in the door, and has a snap fit that's reasonably secure (though it wouldn't stay on if you dropped the box, for example.)

I made this to fit my very specific needs, but if there's someone out there looking for this exact thing, here you go! Consider leaving a boost if this is the thing you were looking for.