[Siam0000]

What happens when they receive the return and the dry Ice has sublimated, partially or as a whole?

I'll answer It for you - a failed SE.

Ok so what should I replace it with when doing the sealed box method

If I'm not mistaken the sealed box method's purpose is to make your package  look like it has never been opened and to discourage them from checking whether or not you returned the right product.
Thus you could throw  anything inside  the box as long as the weight matches

Understood I’ve seen ppl in this thread use fake details how do I make a pre paid card tho without my id

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Ok so what should I replace it with when doing the sealed box method

If I'm not mistaken the sealed box method's purpose is to make your package  look like it has never been opened and to discourage them from checking whether or not you returned the right product.
Thus you could throw  anything inside  the box as long as the weight matches

Understood I’ve seen ppl in this thread use fake details how do I  make a pre paid card tho without my id

I was gon cancel the card I’m still deciding to use my addy or use an air b n b