A few thoughts.
The 91 does not have any kind of smart key. If you had any key, you could get a copied, and anybody can do that, but I understand you don’t have one to copy. When the Road Ranger hit about 250,000 miles, I had the keys, but the keys were all worn out. They would start the truck, but I couldn’t get the doors open reliably. I went to a “real“ locksmith, the kind of place you walk in and there’s 2000 different teas hanging on the wall behind the counter, and they were able to get the key code from the VIN number and cut a brand new key. I didn’t have to change the ignition switch, change my door locks, or anything. If it helps, I use the Sandy springs locksmith in Atlanta, and I’m almost positive. They will do it for you long distance if you simply send them your ownership papers. The shipping will cost more than the keys.
Another thought. A friend of mine had a 60s Chevy nova when we were going to high school around 1970. Hold that thought. When I was in college, a couple years later, I had a 1962 3-wheel drive Chevy pick up. What they had in common was that you could open the door and turn the vehicle on with a screwdriver, a metal spoon, a key from anything that would slide in the hole, including a house, key, etc. Have you just tried taking something a little smaller and wiggle it around and seeing if the thing will start? Of course this is a Ford, and not a Chevy.
And perhaps something I should have started with. Do you have collision and comprehensive? Do you by any chance have replacement insurance? If you do, and the insurance company hasn’t come out yet, quickly get some gasoline and earn your truck up, and then tell him it was lost in the fire, and get a new one.
As always, my two cents, hope it helps
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