First of all I apologize if this has already been discussed, I searched and couldn't find it.

The other day I tried to import my wallet from paper back and I probably had some mistakes when typing,

but instead of the regular error message, I restored a wallet which wasn't mine!

I didn't pay much attention to it and afterwords I restored correctly my real wallet but then it made me wonder,

How many different armory wallets are possible?

How come wallet id's are so short? (like 9 char long, each char can be a digit, small or capital letter - (10+26+26)^9=13,537,086,546,263,552 possible wallets -

is this number big enough for the whole world?)

What is the probability that someday someone in the world will accidentally restore my wallet in his PC?

thanks

The answer is the usual too-big-to-fathom-answer. There's 64 bytes on your paper backup. That means there's [a lot] more possible wallets than there are atoms in the universe. Your question is essentially whether if you pick one atom in a planet a million times larger than earth, 3 billion light years away, what's the chance that I pick an atom that's even in the same galaxy? Much less, even the same atom (or within the same cubic mile?)