Question about Macbook Refunds

I am thinking to do a macbook pro refund from apple. But i have a question.

What happens to the serial number or the model number or any ID that is related on the macbook, isnt that traceable?

I want to use the macbook, not sell it.

Please advise.

People that have refunded MacBooks and used them have had no problems thusfar.

Nothing happens at the moment but that can change at any random moment if Apple decides to go for it.