Such documentation is not allowed to be redistributed or publicly shown. I don't work for Apple retail, but I have a set of the Apple retail documentation because I was made to go through that awful course. I'm not confusing anything, I'm stating exactly what is said within the employee handbook. Go read through your BF's handbook, if he still has it, and you'll find the lines stating such.
There is no "handbook".
As for PurpleRestore, it's not used in any retail stores. Ever. The only reason to use PurpleRestore over iTunes is for internal dev/refurbishment - which retail don't do. The only thing retail do is test, swap and occasionally fix phones.
Anybody with an iOS Developer account can sign in and use PurpleRestore to restore public firmware. You don't need any special "Apple employee account". You would only have to have an internal apple connect to sign/install non-public builds, and if you think retail have access to that, you seriously don't understand how Apple works.