O.K. mart ...it's a box for holding opium .
Sometimes they were more like 'kit' boxes (of various sizes) , holding a pipe (or 2) , a scale , some 'pokers/burners' & opium .
Opium houses (dens) often used small boxes to hold/dole out opium to the folks who attended them , often with a simple lock for the hasp .
Some opium boxes commonly have some sort of motif related to the symbol of the 'opium den' (or the Tong [crime organization , aka "benevolent brotherhoods"] that ran them) , or of the opium poppy .
Not every box (not all were 'box' shaped) has an opium-related scene/motif , though !
If you do a search of 'antique Chinese opium boxes' you'll see a bunch , mart ... even though you're runnin' dial-up over there in Texas !