Bought a cpo bmw, no accidents showd on the reliab...

Bought a cpo bmw, no accidents showd on the reliable carfax...the previous owner hit a deer on 5/2014, i bought the vehicle 11/2014, car fax did not show any acidents, nkw carfax show the deer accident on the report on 3/2016. Almost 2 years later when i am about to sell the vehicle. Now what happened during that huge time span???? No phone # to contact carfax, they reply late by email with useless disclaimers. Carfax is worthless if they let something like this slip through for almost 2 years.