The resolution a 10 meter telescope on Earth can make out of the moon is about 22 meters per pixel. We can yet make out the moon landing site with earth based telescope.
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/...