​Extra piece of leather came with my loafer, also with a weird little chart I can’t decipher?

Bought these loafers at TK Maxx today but can’t figure out what the leather piece is for, or what the little chart means. Brand is Jo & Joe, no idea if that’s relevant or not. I’m just so curious and can’t find the answer via Google.

submitted by /u/boudicas_shield
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