[ludwigsholyblade]

FTID necessary? Or would it become the merchant's word against mine, leading to PayPal siding with buyer if they received the return parcel with a correct weight?

Yes, I did. Now I can just send them whatever so long as the weight matches?

As previously said:

Packages are weighed on consignment, hence you'd need to match the return with the original purchase.

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For PP, is boxing like that fine? Shouldn't he do FTID?

I think FTID is flawed because you could have a delivery exception or refused parcel by whoever recieves the package. Tracking must read delivered for PayPal to issue a refund