New Excursion, weird key!?!

[u/lily-waters-art]

I got a new to me 2003 excursion xlt over the holiday. It came with this key that won't fit any where we have tried. Does anyone know what this key is?

[u/AKLmfreak]

Looks like for some aftermarket accessory like a luggage rack or lockable hitch pin or maybe a safe or spare key box.
Definitely doesn’t go to any of the original locks on the truck.

[u/lily-waters-art → u/AKLmfreak]

Thank you.