Not many.. and not all of our old notes, just this bird series ones.. and I only have one of each up to the $20 denomination.. probably many of $1.. they're so ancient I can't remember.
I believe I have many more collections though not religiously - like a collection of tote bags. I collect rubbish stuff on and off but I do not have things that I must get to add on to my "collection". I used to MUST get that purple thing, almost like a disease.. I'm less serious now. lol