If it boots up and says google and shows the lock below and its unlocked they can tell if ur bootloader is unlocked. I bet if u take it in though they wont even look at it whats the worst they can say? Besides it not like a huge secret we own androids we are gonna experiment we are there power users that keep there upgrades coming. Take it in tell them it crashed u dont know. It will be fine the worst they can say is no we cant replace it!