OnePlus One Display Genuine or duplicate ?

Hi Guys,

I have OnePlus One whose screen is broken. The touch is also not working.
I contacted a local repair guy, he told me he can install the Original Original OnePlus Display for ₹ 2500 (~37$).
He also has duplicate display for ₹1500 (~23$)
He said he has another OnePlus One device from which he will remove the display.

I dont know whether to trust him or not. Is there anyway through which I can make sure the display he applied ot my phone is genuine ?

Thanks