If that doubt is concerning the time DMV keeps those records, then you must know they're kept for only 4 years from the date of the accident. There are, thought, a few situations that requires records be kept for little longer, as you can see in Vehicle and Traffic Law Section 201.
Do you want information about how to get a copy of an accident report?
Yeah, I would like that, thanks.
Do you want to know the procedures to do that by mail?