But they did not use any backdoor. Etchalon is right - if they had to access file system how should they do that if it was encrypted? And you were in control of

But they did not use any backdoor. Etchalon is right - if they had to access file system how should they do that if it was encrypted? And you were in control of the situation - next time change the password to temporary one before handing it over. And if you are really paranoid decrypt and encrypt the drive afterwards to have new encryption keys ;-) EDIT: spelling.