Arrow heads yes. Their stone. Anything made of metal, no. Ever seen the corrosion of a car that's sat for just a decade or even several decades? Ever see a picture of a metal fork or knife that's been found buried in the soil for just a century? At first glance it usually resembles a piece of rotting wood in colour. Ever see a piece of metal like a sword, knife, tool that's been buried in soil for three centuries or more? It appears as a piece of soil. It's original shape is usually 50% or more gone. Only the thickest part will remain to minor degrees.Skeletons may be hard to find, though that has been done. But the weapons used in those wars would not. Armour, arrowheads, swords, would still be found. Nothing like it has been found at the Hill Cumorah.
The only metal that survives to any visual degree of recognition is that which has been wrapped in something and buried in a container or in the clothing of a person buried. But metal left sitting on the topsoil that is covered by dirt and dust for decades to centuries, they rust and erode like acid has been poured onto them.