The outcome should be exactly what you agreed upon in advance with respect to a package getting lost.
If you didn’t plan ahead for that possibility then I’d imagine the sender of the lost package replaces it (or cash value) because they were essentially the seller of that item and you were the buyer. Their duty is to get it to the buyer. If they had tracking and it was marked delivered then lost though then they’ve done all they could.
Ideally whatever was agreed on ahead of time lol. That’s why things like “market value” can get tricky because at one time it isnt a singular set value and lately especially you’ve got some stuff doubling in two weeks time.
There is no good answer for this really. Time for some compromise.
Tricky. The person who lost the card knew it was a possibility. The flip side is that even if they couldn’t have insured it, they could have sprung for a much more secure option. FedEx etc. so I would say blame is on the sender. Even though it’s really not anyone’s fault.
I think they need to send the card they received back or pay fair market value.