I found an old pack of blades that I think came from Walgreens. They have the used storage in the back. I wouldn't consider them vintage but they have sat there for a while....
The blades were full of soap scum and what may have been rust until i wet them and wiped them clean. No possible rust that would effect the razor itself.
I may have to get the scope out to see if they have rusted at the edge but they look relatively fine to the naked eye.