Apple TV 3rd Gen

This is a user-to-user forum. You are not addressing Apple here.

That being said,

• Apple Trade In is not available for the Apple TV box.
• If you want to sell it, then do so privately, online or locally.

As in money? Nothing (£ 0) I think, I believe the disassembly may cost a bit more, but is often subsidized for environmental responsibility. That’s how it works where I live anyway.

That is correct.

If you bring it in to Apple, they’ll collect it for raw material recycling.