Things that are more than 50 years old that the State of Floriduh has laid claim to:
Rocks- every rock on the planet.
A good portion of the beer cans that we did up offshore could be 50 years old...buried 3 or 4 feet in the sand.
Lead sinkers and fishing lures. How do we tell the age of lead sinkers? We find lots of them...should we leave them 'in situ'?
The crow bar I dropped in a pond when I was 11. Never did find it and I can't now.
The batteries, engine blocks and other things dropped off every dock in Florida 'back in the day'. "Earl! You gonna carry them 4 8D batteries to the truck?" "Hell no, Ted. They're heavy." Splash.
90 percent of the shipwreck treasure hunters I have met, except for Carl Fismer and the elusive Pat Clyne, are old enough to be classified as submerged cultural resources. Those two are ageless...guess that's what happens when rum is used as a preservative.
Ahhhh, Florida.
For more escapades of the intellectual elite:
FloriDUH: Weird Florida News - Orlando Sentinel