I could be wrong, but I was under the impression that 60 day window was after the date of the 'action', the reg states below. I get the 'innocent until proven guilty' and all that, but, the FAA is not judicial and the reg clearly states written notice after the motor vehicle "action" - the third bullet point also makes a point to clarify "conviction" or "action" ..
61.15(e)
Each person holding a certificate issued under this part shall provide a written report of each motor vehicle action to the FAA, Civil Aviation Security Division (AMC–700), P.O. Box 25810, Oklahoma City, OK 73125, not later than 60 days after the motor vehicle action. The report must include:
(1) The person's name, address, date of birth, and airman certificate number;
(2) The type of violation that resulted in the conviction or the administrative action;
(3) The date of the conviction or administrative action;
(4) The State that holds the record of conviction or administrative action; and
(5) A statement of whether the motor vehicle action resulted from the same incident or arose out of the same factual circumstances related to a previously reported motor vehicle action.
Anyway, good luck.