[2020] Looking for J-Mod response! I've looked around for any sign of this being possible, but I can't find any! There must have been a bug that allowed me to do this at some point. This is the "Monkey" item from Monkey Madness. Any other records of this existing in game?

I don't think he's happy there. :(
I'd suggest releasing him on Karamja for some thieving xp. :)