Originally Posted by JanetJ
One more question - when you speak of "mailing boxes" are you refering to what the cards are mailed in?
Yep-I have used priority flat rate boxes but whatever you think will work best for you. It is nice to watch the box fill up as you complete challenges. I try to throw a few extras in there too-sometimes duplicating the card I make for the challenge or by raiding my stash.