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If you are talking about the cap on the end of the pipe where you hook the hose to dump, I don't think that would be it. If it is that cap your dump valve is leaking. It is a gate valve, could be something as simple as some crud keeping the valve from closing completely.
I would think more like a leak between the toilet and flange. How is the floor? It could have been from the sink if the floor is rotten beneath it. Dump some water down it and see what happens. Water can do some weird things. As long as the tank is dangling, give it some time and keep watching. Even if it goes in just a few drops at a time, it probably will never come out until it rusts through.
If you don't find an obvious leak, that might not be suprising either. If the metal is completely gone, it could have been defective from the start. It seems like a leak would have caused it to rust out in an area on the bottom, then drain. It would continue to rust because of the moisture, but it does not seem like anything but the bottom would be really bad. Sort of like the floor on an old car will rot out, but further up it will not be as bad.
All they really need to make a box is the dimensions. You might have a harder time getting it to a shop in one piece than they would making a new one.
John
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