Spid and Truck Anomaly on New Truck

[Already Gone]

I bought this truck yesterday and found something a little strange. I am a little confused and maybe someone has run into this issue before. This truck was purchased new by Grandpa and when he passed away 15 years ago he willed it to his Grandson who I bought it from. So the truck is very original. What my problem is that on the Spid it shows the E81 Wood Box Floor Code but the truck has a steel floor. Now i'm thinking and knowing how fast the factory pushed these trucks down the assembly line maybe it was ordered with the wood floor but when it was on the assembly line they ran out of wood floors so just put the steel floor in the truck to keep the assembly line going. Any input or ideas would be helpful to all of us on here.