idlemarvel
Neither idle nor a marvel

I bought a loco from Ellis Clark which was described as RC but in fact had a Massoth XLS decoder inside. I think they got the concept of a DCC wireless controller mixed up with radio control.
Unless the lack of chimney is a showstopper perhaps you could ask the buyer for a picture of the instructions referred to, it might give a clue to what the previous owner has done.
Unless the lack of chimney is a showstopper perhaps you could ask the buyer for a picture of the instructions referred to, it might give a clue to what the previous owner has done.