Are all the rounds corroded that bad? They might look nice in my collection
Ok, what you have is old repacked German WWI ammo. It's just short of 100 years old and I wouldn't expect any kind of reliability. Some might go bang, some might hang-fire, and some might do nothing. I don't recall seeing that box before, might interest a 9mm specialist collector.
"...old submachine gun ammo..." No such thing.
I'd guess it's commercial. No NATO number on the packages. Only has collector value if the boxes are closed and sealed as they came out of the factory. You should be able to figure out where it was made by the headstamp. Start here. http://cartridgecollectors.org/?page=headstampcodes