OP pretty clearly said he has one key.

Or one could buy a key online, use FORScan, and spend a fraction of that to accomplish the exact same end result.

 

I was in same situation. I followed the advice above for passenger front bottom right fuse box cover/trim removal...my 2015's code is on a white sticker on the back of that fuse box, but with a flashlight and a keen eye I could see it. I didn't have to remove the fuse box itself, but did have to remove a large piece of trim that was a bit obnoxious.
I would bet $1 yours is in the same location.

 

Just to be clear, that is the BCM (Body Control Module), not just a fuse box. That box controls about 75% of what happens in your truck.

 

Got my new warranty fob today...still able to get the code as it was programmed as an admin key...
unfortunately the tech didn't erase the original so truck shows 3 admin keys...
to get the code do the cycle quick don't wait for the display on the first key..cycle on/off and get second key in.

 

I would take it back and tell them to remove that code.

 

Then you should have been worrying all your life. Physical vehicle keys are not unique... they only have so many patterns. For that matter, the same is true of the key to the lock on your front door at home. The security lies in the unlikelihood that someone else with the same key as you will try to open your door, but it was not unheard of. I've known a couple people who walked up to a vehicle in a parking lot they thought was theirs, opened it with their key, then realized it was not their car.

Modern keys add a layer of complexity with the RFID chip in the fob. I wouldn't lose any sleep over the miniscule chance that the person who used to own the vehicle and might still have the key, would be carrying that key, stumble upon the vehicle, and try to open or steal it.

 

Not to mention the way these vehicle are shipped all around the country after hitting an auction

 

It was replaced on warranty...being sent back for claim.. likely will be destroyed...I'll live with dash showing 3keys

 

Here's what happens to the majority of missing keys:

Owner loses key to truck in 2006. Owner sells truck in 2012. No longer owner gets a new bedroom suite in 2016. No longer owner sells old bedroom suite in 2018. New owner of no longer owner's old bedroom suite finds truck key in bottom of bedside table, tosses in garbage.

I've found vehicle keys that found their way past the seat and back cushions in the rear. The missing key could be in the truck.

The chances of the previous owner of your truck, or an acquaintance, having the resources to hunt down your truck, or hell, even the desire or need to steal it, are so infinitesimally small you'll need negative powers to express the possibility.

Thieves steal tow trucks to steal vehicles. Your best recourse is a well hidden gps tracker.

 

True, but I would still want the second key just incase something happened to the other key.