@CatHerder
An Idea might be, try selling it to Software Hut in Bulk. there are people out there who need the Dongles. Maybe they never got around to getting the Dongless version.
You need to find out if they are MM400 dongles or MM300 dongles...or even MM200 Dongles or InfoChannel Dongles.
I think they may have used different ones for different versions......I tried my MM300 dongle on MM400 and it didnt work.