How do I Identify OO=nePlus 2 US Version?

I bought a OnePlus Two from a dude at work, and he claims that it is the US version (I am in the US). I want to confirm that it indeed is a US version. Are there any identifiers on the package or in the device settings that would confirm it one way or the other?

Thanks in advance!

PS: Sorry for the messed up title :(