Well, i had a friend who adjusted from F1 to permanent resident after he won dv lottery. Anyways, he had been working illegally prior to that but USCIS never found out during the adjustment process and this was 2 years ago.
Anyways, yersterday he got a letter from USCIS stating that the record shows that he had been working illegally prior to his adjustment of staus and that he is to pay a fine of $495.
Well, it is kinda weird that they dug up his file 2 years later for absolutely no reason. This is just FYI for some of you folks.