Oh dear. I know amateur radio operators who downlinked Apollo telemetry data, which they could not do if the CM/LM combo was not where NASA said it was.
Actually, the astronauts on at least some of the lunar landing missions left behind laser reflecting corner cubes that are still used today for precise laser ranging of the moon to update lunar orbit predictions. For those interested, the lunar orbit of the Earth is one of the most complicated due to the larger moon/Earth mass ratio and due to both bodies being perturbed by the Suns gravity (as well as Jupiter and Saturn) differently. Kepler’s laws only work for short durations for the moon as they assume what’s called the two-body problem (i.e. the Sun and a much smaller Earth, or the Earth and a much smaller satellite). When you have multiple gravity sources playing off each other its gets really complicated math wise.