That is an interesting thought Chrisjo so I went to take a closer look and my mistake, there is a picture that shows that the pot does have some type of material in it. Showing the entire lot in case some came together and because of that more recognizable from where they might be from.
A little further amateur detective results may indicate that this car automatically tips when, what I assume, is a black lever is tripped by something within a large set. Also note the crucible looks to be offset and a portion missing on the levers side to enable it to rotate down and release its load or to emulate it dumping its load.
A little further amateur detective results may indicate that this car automatically tips when, what I assume, is a black lever is tripped by something within a large set. Also note the crucible looks to be offset and a portion missing on the levers side to enable it to rotate down and release its load or to emulate it dumping its load.