Rusted or dented cans are acceptable as long as there is no puncture in the can.

Hmm.

Explanation:

If there is a little dent from it falling then it's fine.

But if there is RUST, then it's not acceptable! The food in there is most likely spoiled by now (it takes around two to four days for rust to form, and it has to be in a hot sunny spot).

'Cans that are heavily rusted can have tiny holes in them, allowing bacteria to enter. If you open the cans and there is any rust inside, do not eat the food. Rust (oxidized iron) is not safe to eat.'