They are clearly models of at least some kind of a shed, with roofs acting as a loose lid. I have enclosed a picture of one of these. You are also bringing up the question of the possibly use for this piece. Obviously this example was intended as a funerary gift but if they had any counterparts in ordinary life I don't know. This information is given as an example of private conversation only and is not intended to be used as a promotion of any individual piece.
All opinions is the authors and is given as such with all hazards of judging anything from a photo.