I agree with the others that said the chances are that's the end of it. When there is a pilot deviation, ATC is supposed to inform you right away. The standard language is
(Aircraft ID). Possible pilot deviation. Advise you contact (facility) at (telephone number)
The ATC handbook says "workload permitting" but there are a couple of NTSB cases suggesting that failure to give the advisory when ATC can means no penalty (that doesn't mean no violation).
The standard pretty much means that in most situations, if a pilot doesn't hear it at the time of an incursion or other deviation, it's unlikely that he'll hear about it later.