I was almost on the same wavelength as you, but something didn't quite feel right, hence posting the dilemma. If I dropped a tenner in the street I'd like to think that someone would stop me and point it out, so in a sense of do-as-you-would-be-done-by I don't feel right about keeping the money. Also, if it ever came out that I had profited by means outside my contract while on company time then I would be kicked to touch.

I think my next step will be to contact the hotel. If they are happy that they have been paid then I can contact the CC company again. Seems weird to be chasing people to give them money though...