Have any of these moon landings been done at night where people have been able to watch it happening through a telescope? Or are things so small at the moon's distance that there'd be nothing to see?
Actual landers tend to try to land during lunar day, to take advantage of the warmer temperatures and to have sunlight to recharge batteries.
There are lunar retroreflectors about a metre across [0] that are detectable with optical equipment, for some definition of optical. But to leave a mark that can be seen from earth - to leave your tag, or an X, or a crude drawing of a penis and testes - surely that's an urge as old as art itself.
[0]https://www.nasa.gov/mission_pages/LRO/multimedia/lroimages/...