A couple of thoughts come to mind but I don’t want to waste your time trying them if they won’t work so I’ll shut up.
Or you could just buy 5 new ones for $13.99. https://www.amazon.com/TOPSELL-Flash-Memory-Drives-Colors/dp/B06XK8PPDX/ref=sr_1_14?s=electronics&ie=UTF8&qid=1548618094&sr=1-14&keywords=1+gb+usb+flash+drives Includes free shipping.
BTW Links to locked postings works.
Good luck.
