Well, the person I sent this to laughed. He thought it was hilarious. Unfortunately, the whole joke was in the message I attached to order.
Looks like to be able to see the message attached, instead of having a card or something in the package, there’s writing that says “to see your personal message go to *this site*”
My friend was just kinda like “oh haha, that’s funny”. But after he saw the message he understood the joke and wished he saw the message when he originally opened the package. So, hopefully you don’t have to attach a message to get your joke across.