Mercedes Modules Already Programmed From Dealers

I am in the USA.
I don't do remote programming for a living, I do get shops asking for help in configuring replacement modules.
We connect to their shop with TeamViewer and try to help.
I have seen all new modules from Mercedes and BMW in the last year or more coming already programmed.
I helped a shop in Albuquerque a month ago.
Garrett called and said he needed to replace an ESP on a Xentry car.
He wanted to know if he could complete that job with what he has.
I got on TeamViewer with him and connected to the car and chose Initial Startup. It showed the needed steps. Initial Startup, SCN, road test, blah, blah, blah.
I told him we cannot do SCN, so no, you will not be able to complete this job.
Garrett say's, "my MB dealer won't sell it to me if it needs SCN!"
I said, "you just read the same thing I did, right?"
So he calls the dealer and they promise him they will accept the return of the module, "no problem" if we screw it up while trying.
So, in it goes and we connect to it.
I clear all faults in systems.
I go into ESP.
Actual values is already showing steering angle, voltages and wheel speeds.
So I click on VIN and Xentry complains, not same in ESP.
Go to special functions, write VIN to new module, road test, perform calibrations, ESP lite goes out.
Clear faults, bill the customer, get a
I just did that again today on a 2010 C63 AMG in Utah.
Same thing on an FRM on some BMW last year, already programmed from World Pac!
The box it came in had another shops name on it so I am not sure the other shop didn't program it.
We just coded it to the car with online ISTA-P, done.
Have any of you noticed the same thing?
Thanks, from just one of the lazy and stupid Mercedes USA guys!