In 2018 you were paid $500 for your 100 shares purchased at $100 for a $400 gain then you have used the basis in your shares already.
It looks like you just got $10 that would normally have been part of the 2018 sale. I agree with Robert that it seems like you should have a basis for this money. I just don't see one.
The money is from 2018 so I would use that for purchase date and you have no choice but 2023 for sales date.
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