How do you authenticate a Short Bed truck

[Drive-In 4x4]

I've been looking for a short bed truck for sometime now...The ones here in my area were all born long beds. I've been looking on E-Bay for a 71-72 Super Cheyenne Short Bed and all of them claim to be original. Well I would like a little more proof. Since I can't be there to look underneath I would like to know of others ways to authenticate the short bed (fleetside) option from a want to be. I know there is a placard around the drivers door striker that shows weight/capacities. Could someone tell me what it should read if it was an original (fleetside) short bed? I'm guessing but some of those weren't fleetside in the beginning either so would it read the same as a stepside truck? The sticker in the glove box tells you vin number and all the options. Is there anything about the kind of bed on there? I noticed model number in one of the pictures on E-Bay is there anything within that number that might indicate bed style? I wish I could've checked out the truck I'm speaking of on E-Bay I'm pretty sure it was the real deal. It was a Super Cheyenne short bed 4x4 in unmolested condition. It looked to be a little rusty in the worst spots to have rust. Still though I would've liked to look at it but it was to far away. I'm trying to stay in th Colorado to Illinois Texas to Nebraska area...However I'm starting to think most of these were not sold in this area. The ones sold here were sold to farmers for work trucks. Maybe a few sporty models were sold but I'm guessing most were purchased with work in mind, not play. This is my first question on here as a newby and I NEED to know. Thanks