Items in the room can either be visually checked in the Items in room window or in the Item occurrence window, or you can get an exception report of the desired room. The last option is the best if you are to check a large number of rooms.
Validate occurrences between dRofus and model
...
Occurrences in room can be validated between dRofus and the model by selecting the Occurrence match panel on the right side list of available panels.
...