Never doubt that Apple is the master of packaging. My replacement credit card came in the mail today in this unnecessarily beautiful wrapper.
The envelope itself has an NFC chip. You touch your phone to it to activate the card inside.
For Science™ I read the NFC with my Flipper Zero. It didn’t seem to contain any personal information. My guess is it’s a code that the phone interprets as “open the Wallet app and activate that credit card we told you was on the way”.