I bought a used Macbook air and it came with activation lock. Seller said he bought it from another person and that he lost his contact and didnt get the receipt either. Is there any way to find the original owner with serial number?
No. Return it to the seller and get your money back.
If they refuse, turn it over to the police along with all the information you have on the seller.
None that I know of. I don't think Apple would give you the name of the original buyer. And whoever set the activation lock is the one who can unlock it.Activation Lock for Mac - Apple Support
Activation Lock - Macbook air
