If nothing was mentioned, imo, it is the seller's responsibility to get the card/item to the buyer. It is the buyer's responsibility to pay for it. If the card doesn't get there it is on the seller for a refund. That is if nothing is agreed to beforehand concerning shipping.
I believe all 1st class now comes with tracking and $50 insurance. Again, on the seller to go get it if he wants it.
Here is a 1949 Vis Ed card of Doby....because threads need cards.
