I inherited a collection of old reeds when I first started teaching. These were in small cardboard boxes, loose with some type of padding to hold them too. I don’t know that they were 10 years old, but definitely not new (seeing how a box of them was only $2 according to the sticker on the box).
I used them as backups – in case a student came to rehearsal without one, or broke one and didn’t have extras. They weren’t the greatest, but they worked for the day. I’ve personally used them too.
I would try them out.