Me? Cards are quite expensive even the regular bicycle cards. I lose some cards, but I have spares from my previous worn out deck, and add them up to my new deck. this keeps them complete. When I find out that my spare cards lack the missing card from my new deck, I add a duplicate instead, so I can perform tricks with dupes...hope this helps...
Do this often enough, and you'll end up with a one way force deck

Seriously though, as others have said, it doesn't really matter. It's important to know which deck is missing what though, because if you want to perform, say, Sam the Bellhop or some mathematical effects, you need a full deck. Also, if you have a deck with you and someone asks if you want a game of something, knowing whether your deck is full or not is good. Still, as long as you keep track of which decks are full and which aren't, it shouldn't pose a problem.
Good to see you found it though; they usually turn up eventually if you look hard enough...