I've got lots of 3.5" HD floppy diskettes. All in cellophane. They were driver diskettes for laptops. I broke up quite a few for parts when I had my laptop business. I've been using these diskettes for my own needs for a couple of years and haven't had a problem with failures. You need to delete what's on them and remove the labels or put a new label over the old one. I can stick a bunch in a box and post them.
Don
Don