Agree with Paul, those lifters look like 100,000 miles on them, not a few hundred.
New lifters have a convex surface being high in the center, lower on the edges. Everyone of those look concave (dshed) in the picture, the cam lobes have to be rounding off also. The engine has a bunch of fine powdered metal in it too from the abrasion between the cam and lifters. Not a good scenario in a fresh engine.
FWIW, I would take an oil sample from it and send it off to find out what additives (ZDDP) and at what concentration they are to find out if it's the oil that caused all 16 to wear that quickly. It wasn't just one lifter, and lobe to fail, they all failed.
