Did you get NexusProtect or choose to pay for the extended coverage in addition to your bill?
If you did not get NexusProtect, you're covered by the 1 year warranty from Google
If you paid in full up front for NexusProtect, you're covered through Google for 2 years.
If you chose to pay monthly with your bill from Fi, you're covered by the standard 1 year warranty from Google.
I think I covered all the bases and have it correct...