Two of my 8x10" Kodak film holders have an arc on each side of the centre.

I have bought quite some film holders, with most faults: extremely dirty, tape missing, cracked folder, cracked frame, corroded aluminium, hard-to-move dark slide, broken dark slide, dark slides letting IR through, missing light trap etc, but I have not seen this until yesterday: two 8x10" Kodak film holders arcing so much i doubt they will be light tight in the camera due to not seated, the other one worse than on picture!

Any suggestions for this, other than sell it on ebay as " I don't know what this is"

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