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It was prob. replaced (the door) and they didn't transfer the sticker. call your local ford dealer or try a good body shop, give them your vin# and for a price they can get you a new one.
I had the same issue on a '99 F150 I bought a few years back; tried to go to Ford MoCo but they wouldn't help.
A long story made short: the previous owner had rolled it in a ditch and the body shop made a lot of body repairs. Of course, the Ford dealer selling me the truck didn't mention that but I don't know if they knew it and it was a pretty good discounted price for a 4-year old truck. I called the PO later about the trans a few months after the purchase and found out about the rollover.