They're in some sort of heliocentric orbit [1]. They didn't track them. One's been rediscovered, initially designated as asteroid J002E3 [2]. [1] https://en.

They're in some sort of heliocentric orbit [1]. They didn't track them. One's been rediscovered, initially designated as asteroid J002E3 [2]. [1] https://en.wikipedia.org/wiki/S-IVB#Stages_built https://en.wikipedia.org/wiki/S-IVB#Stages_built [2] https://en.wikipedia.org/wiki/J002E3 https://en.wikipedia.org/wiki/J002E3