It's an 2001 F250. And like you I don't leave anything in it.
Funny story about the whole deal.
The guy that took it was in a fog or just plain brain dead. His truck was parked several places away and he thought he was getting into his own truck. His key worked in my ignition and he drove it home. Once home he realized that it wasn't his truck but he didn't remember where he took it from. He was out running errands and made several stops so he backtracked to all the places he had been. I had already called my wife to pick me up and we were standing there talking about it with a friend. She looks at me and says "stay calm". What? Here comes your truck and the cops are right behind it.
My truck is a fully loaded lariat package with leather seats, captain chairs with armrests and wood grain dash. His truck is a stripped down basic work truck. Bench seat a rubber floor. How he didn't realize that he was in the wrong truck is beyond me. Especially since he threw away my mountain dew that was in the console cup holder. He doesn't even have a console since he has a bench seat.
There's way more to the story but it is really unbelievable.
I used to have a 79 F-150. Remember the old fords used to have the double sided keys? The key to my truck would open many Ford doors. Not the ignitions, just the doors. I was at Home Depot one day, and I saw a guy in a Lincoln trying to get in his car. He locked his keys in the car. I walked up, had a short conversation with him, stuck my key in his door, and unlocked it for him. He just about pooped his pants.