I had a friend who got a letter from the FAA (fortunately a tail number mix up) that he didn't receive until nearly two months after the "incident". So sadly you have quite some time.
If it's the school I'm thinking of I've worked there in the past and can absolutely understand the "attitude" comment about the students. I ran for the hills as soon as I could find another instructing job and never looked back.

The important thing is CYA. You've filed the reports. You've touched base with the instructor. You've properly documented that the student did not adequately prepare for or execute the flight. I would keep all that info stored away in case something does come up, with the NASA report right on top.