I have this spare very nice 1989 (Dec 89 to be specific) Mumbo box for trade. It's not a Mumbo without this type of box. Very displayable, comes with paperwork and foam specifically cut for the taller Heater lens (box sticker matches of course).

Willing to trade for a mint Gen1 "Mumbo with Hammers" box complete with papers and foam. Don't care about box stickers. I have more sets in need of the Gen1 box, so this rare Mumbo box is up for trade. Possibly also trade for a rare color Gen1 M Frame/Mumbo nose+ear unobtainium kit. Trade only, will not sell.

Nice box
I'd be up for a buy don't have a spare one of what your after I'm afraid