To eat the biscuits?

[LifeIsGoodish]

A mystery parcel has arrived, addressed to me. No clues in the packaging. No clue in my Amazon order history.

Shall I eat the biscuits, or should I query it first? Could I be billed if it's some sort of mistake?

Yes, the Amazon delivery driver brought them. What the OP wants to know is who bought them

You can definitely eat them. Or give them to me!

But they are a gift, it says so. Even if it is a mistake, it's not your mistake and there's no reason to think they weren't intended for you.

Have you looked at all the bits of paper? There will be a gift message in there