Do get something in there for scale, always! Initially I'd have to agree, large cents. Found often enough along east coast. It is sort of the curse of large cents, they're too frequently worn smooth.
On your musket balls, there's no way to date them. Our really old ones are pure white, with a thick crust of patina. You can measure them and get a caliber though.
I'll say this however. If you found that many LC's and that many musket balls at that location, I'd be all over that site. Congrats on the finds.
Make sure to try oblique lighting on the LC's, some detail may show up.