[mothered]

I have replied asking for the footage.

Good.

We shall await their reply.

If it fails I will then wait 7/10 days and say my brother kept these at home whilst I went on vacation. Upon my return he told me about this.

Good approach.

If their cameras confirm the sunglasses were checked at the time of packing, you can return them for a legit refund and use another method on a different account.