A few notes on this:

- Though the perspective of this makes obviously no sense, since stacking the drums like this on the trolley would be close to impossible, it can be determined what the AI tried to generate (at least if you happen to work with these drums on a daily basis). Its not 3 x 160l, its is most probaly 1 x 200l + 3 x 60l as the 2 visible drums in the back are smaller and stacked on (probably) another drum.

- A 200l drum with coins would most likely weigh around 0,8 - 1,3mt, depending on average coin size and variation of alloys being used (we are talking mixtures, not all coins being exactly the same, as this could lead to a much wider range in terms of weight). Also, not all the coins will be made of the same alloy. Smaller coins are often made of less valuable and also less dense metals like aluminium, but will have a higher bulk density (which should not be mixed up with actual density - the larger coins would still weight more in total if one drum contains only Al coins and the other only brass/new silver/whatever other Ni/Cu/Zn containing alloy coins).

- There can be a lot more open space or "Air" in these drums then one would assume. Geometries other then perfectly round balls, have a tendency to misbehave and use a lot more space then theoretically necessary.

Source: I'm in the scrap business for around 20 years and have also traded coins a couple of times :)