How to Tell if I have the T-Mobile Variant of Moto X XT1053 and Not Developer Edition

[AxlRose77]

I'm looking to buy a used T-Mobile variant of the Moto X XT1053. What do I ask the seller to check to determine if he/she has the T-Mobile variant of the XT1053 and not the Developer Edition? How do you tell them apart easily?

If the seller bought the phone from Motorola's website, would that help? Did Motorola sell only the Developer Edition, or did they also sell the T-Mobile version? I don't remember how Motorola sold the 2013 phone back then.

Thanks very much!