I hope the person you bought this NAM from didn't tell you it was new.....
F915 is the default maintenance code when the system is new, if you take the NAM and put it on a different KSU it bumps the maint code up to F916, if you hook it to another, F917, etc. With your maint code being at 919, its a tell-tale sign that the NAM has been connected to 5 unique KSU's.
Another obvious sign of age is if the cabinet says "NORTEL"
on the front in black letters, or "Meridian" on top of a green stripe. They stopped manufacturing the green stripe about 5 years ago. A lot of brokers upgrade the software on these boxes and try to pass them off as new.
I see a lot of this lately. There is nothing wrong with selling a customer used equipment, as long as you tell the customer it is used. I've lost count of the people I've ran across that was told their system was new, when in fact, in most cases it was several years old when they got it. These people pulling this crap should be flogged.