not sure this been asked yet

I have my Samsung s4 sprint version rooted unlocked etc all that jazz and on red-pocket carrier. i used their sim card now the phone dot recognize the sim card and also i keep having issues with the google play services error. and bad battery drain i am on the stock deoxed od2 rom with stage-fright patch.

How to check if a Nexus 5 has ever been rooted?

Hi,

I have a small question regarding a nexus 5. Is there a way to know if my Nexus 5 has ever been rooted?
In my office, we are having a connectivity problem with a nexus 5 and after talking with google they request us to send them the phone. They asked if the phone is or has been rooted which, I guess, voids the warranty.

We use the phones for developing software and research proejcts, and I know that some of them some times are rooted, some times use not official-roms, etc. So despite it looks that the broken nexus 5 is a stock one, I'd like to check it and to make sure that it has never been rooted. Is there a way to do so?

Apparently the Nexus 5 is not rooted: play store apps say so, and the bootloader is locked. Still, I cannot be completely sure that the phone has never been unrooted. Is there a way to check that?

Cheers, and thanks for your answers.