International stamps on a symphony card I’m mailing from USA to New Zealand. ?
I’m mailing someone in New Zealand a symphony card. I went to the post office and brought an international stamp. I was given the international stamp along with a USPS tracking number sticker. Do I have to put the USPS tracking number sticker on a card that I’m mailing from New Jersey (USA) to New Zealand? I want to make sure, but I don’t feel the tracking number sticker is necessary for a card.
I didn’t question anyone cause I brought the stamp at a self serve machine.