The pre-inspection will cover the recorded history of the aircraft. Unlike other models, the on-board computer records EVERY over-temp, over-torque, etc. Details of the last (10, I think) and cumulative. Whereas a short and slight over-temp on a Bell 206 might go unmentioned by the pilot (or unnoticed by the instruments) the EC120 does not miss a fraction of a second. Anything serious flagged by the computer has to be looked at by the service organisation and the flag re-set so it ould take collusion of the parties to fake this.
Whilst it is never impossible to fake, change or tamper with a computer-based record it would take both knowledge and fraudulent intent.
I suggest that you have the inspection carried out by the service organisation that will look after the aircraft post purchase - and let them know that before the inspection. There is no guarantee, but one hopes that the thought of "missing" something on the nspection and then trying to tell you that you should pay for the repair is not a pleasant one for them.