They're old, there are vintage blades all over eBay, you don't know much about the collectibility of them, what harm does it do to throw them up and see if anyone buys them? If they sell, it's pure profit. If not, you're not out anything.
There's a very old British joke...
Q. What does a Scotsman do with his old, blunt razor blades?
A. He shaves with them...