I'll dig around to see if I can figure out where I bought them from.If they sold it as a regular Kem cards, not seconds, past return period regulations do not apply. Contact www.kem.com and company you purchased product from. Plus let us PCF where you bought them as a warning. Product is defective so they should replace it, at least that one card in particular.
This is also close to like a decade ago so I'd have to search through 100k emails.
I'll see if I can locate them in storage and message Kem and see if they'll do anything.
I can't seem to be able to buy circle backs anywhere (that I can google anyways) so I figured they were out of production.