By "ours" I assume you mean human, not necessarily American...
I see all space achievements as primarily the achievements of humanity rather than any one nation.
I do wonder whether any of the parts at most of those ~80 sites are even recognizable. An impact of several km/s is pretty violent...
They are still machine parts even if not visually recognisable. Their chemistry and context will also say they are artificial.
About 30 sites would be either soft landings, low velocity impacts, or dispersed artefacts from soft landings.