I have 2 windows keys linked to my account but 3 pc. How do I know which one has the key?

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First I bought a laptop with 10 pro. Then I got a PC from my brother, which didn't have a windows key. So it was shared between them two(It didn't ask the windows key, just worked after my account). Now I got my second laptop, which had 10 pro installed. I linked that to my Microsoft account and upgraded it to windows 11 pro.When I check their product keys, they are all different. It seems that I got a free key from somewhere, even when I didn't.Now I am selling them all and I would like that they all have the proper windows installed. How do I know, which keys are real and which key is the sh

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