Assuming 500K addresses which either have funds or will have funds within next three months,
0.0000000000000000000000000000000000000000034211388289180104270598866779539% chance per check.
Assuming average computer can do 250 optimized DSV-like checks per second,
0.00000000000000000000000000000000000000085528470722950260676497166948848% chance per second.
Assuming a "theft pool" is formed, and 500 of these computers averaging the above click/s,
0.00000000000000000000000000000000000042764235361475130338248583474424% chance per second.
Assuming each theft pool is one botnet, and 20 botnets, exactly the same, exist in these theft pools,
0.0000000000000000000000000000000000085528470722950260676497166948848% chance per second.
Per minute,
0.00000000000000000000000000000000051317082433770156405898300169309%
Per hour,
0.000000000000000000000000000000030790249460262093843538980101585%
Per day,
0.00000000000000000000000000000073896598704629025224493552243804%
Per month (30D),
0.000000000000000000000000000022168979611388707567348065673141%
Per year,
0.00000000000000000000000000026972258527189594206940146568988%
Assume worst-case scenario, DSV-like software can check 5000 addresses (10M of which are funded or will be funded within 6 months) per second, and 100 botnets of 50,000 computers each...
Per day,
0.000000000000000000000000014779319740925805044898710448761%
Per month,
0.00000000000000000000000044337959222777415134696131346283%
Per year,
0.0000000000000000000000053944517054379188413880293137978%
Per century,
0.00000000000000000000053944517054379188413880293137978%
Are we done, now?
ETA: Worse-than-worst case scenario. NSA can check 1T addresses per second, 1T addresses are funded.
Per century,
0.0000000000000021577806821751675365552117255191%
Per billion centuries,
0.0000021577806821751675365552117255191%
