There has been a distinct, if not drastic, drop in the number of Christmas cards sent over the past decade. People are keeping in touch via social media, emails and texting. I guess a Christmas card via snail mail seems a bit old fashioned and redundant, but I still enjoy receiving them; it harkens back to a slower lifestyle.
Anyway, back when you received so many cards you didn't know what to do with them, there were Christmas card holders like these produced by Trimmin Time for Walt Disney Productions. I found these for $1 each at a garage sale this summer, still in their original packaging. They're made in Japan and probably date from the 1960's.