I don't know the odds of actually getting a btc address by accident..
Statistically, not going to happen between now and the heat death of the universe,
the odds are mind-boggingly small for even 12 of the first characters being identical in any two addresses
I can safely bet my life on that not being the origin of your 0.07btc.
The only possible explanation is that you are somehow still mining at eligius, did you check all your active miners?