Why would they put any kind of seal on a full GI can of ammo?
Isn`t the latch and rubber seal around they lid supposed to hold through hell and high water.
This is one of those times when words have more than one meaning.
Seal = Some type of gasket or other construction that prevents leakage or contamination.
Seal= A lock, tag, tape or some thing that proves the container hasn't been opened or tampered with.
So, Yes, the can has a sturdy latch and gasket to seal the can. In that contex, "seal" simply refers to the gasket on the lid.
but "Seal" could also mean some evidence that the container wasn't opened after it was filled and closed.
In this instance, I see no evidence of a tamper proof seal and therefore I recommend the owner simply open the can and inspect the contents.