Eugene Cernan left the last of these in the lunar soil:
I was ten years old.
We also left behind six American flags, six lunar module descent stages, three lunar rovers zero-emission electric vehicles, three retroreflective laser targets, the crashed remains of six ascent stages and five Saturn S-IVB third stages (what, you thought we left them in lunar orbit?), along with tools and trash and other miscellaneous and sundry items, including a two golf balls.
And 39 years later, we don’t have the capability of going back, much less the will.