The expiration date is coming up so they sent me a new Apple Card. It comes in a CD-sized mailing box and quite sturdy. Also during mailing you get several emails telling you it's on the way, it'll arrive the next day, it'll arrive today, it's arrived.

There is a mail back cardboard envelope to send in your old card for recycling. Be careful since the Apple Cards are identical don't confuse them.

There is a nice colored cardboard greeting card-like foldover that has the Apple Card in an insert. The holder is important as you need to put your iPhone on it (with the Apple Card inside) to activate the card.

Hold your iPhone there and a couple sends later you press Activate and you're done.

In any case I don't bring the physical card with me. I bring a Visa and an AMEX card and use Apple Pay on my phone which defaults to Apple Card.