What makes this story so special and unforgettable is the domesticity of the life of explorers on the moon contrasted to the profound gravitas of the sentinel.
The idea of finding an object so clearly artificial, as old as the formation of the Moon, 4 billion years old. Finding a physical object, having that be first contact, is always far more real than a signal.
Though I certainly hope if this happens for real, and we find some billions year old probe sitting on the lunar surface, we don't break it.