The person is asking Steam support to tell them which e-mail is associated with the account. If someone gave you their account, why would it be on their e-mail

The person is asking Steam support to tell them which e-mail is associated with the account. If someone gave you their account, why would it be on their e-mail so many years later? And why wouldn't you know what e-mail it was? I mean, it could be that the person is actually being honest, but if so, then the person has put themselves in a situation where they will never be able to convince anyone they aren't trying to steal an account.