Thank you. This actually makes it much more possible/probable course of events than someone cracking the keys.. ..on your, or anyone's account. I mean, I don't know how much you've lost, but if someone has the resources/etc to actually crack the keys, ehy go after people's wallets instead of the bigbot/pools/etc.. so some kind of a key leakage seems orders of magnitude more likely. I try to keep ears open and inquire to learn how I can leak my keys. So.. here was (probably) a security breach in a safe keystore. Ouch..
Funny thing from last week or two - someone threw out quite a lot of furniture, all not so neatly stacked under a tree near local waste containers. Pretty common thing lately, probably they had their room rebuilt or something - and there was this one desk lying flipped up side down. There was a long piece of paper, scoth-taped to its underside, now on top of it. I thought, wow, someone stuck a note there? What, "please take what you like" or something? -nobody- does that. I came closer and I saw:
"XMR WALLET
private key: blah blah blah blah...."
and there's goes a run of random 13 english words. Typical way of preserving a recovery seed. I later checked, it was actually valid, 0.0 balance, not a single transaction ever. Someone must have generated it, saved the key for later, then never used it. For fun, using their key, I ran a miner for a moment and left them ~$0.25, I wonder if they'll ever withdraw :) but just as likely I could have witnessed someone losing a whole bag of money just because their family wanted to make them a suprise over the weekend while they're away and the renovation team happily tossed their old desk.. (oO)