We buried one when I was in 6th grade. The spot we buried it is a Menard's parking lot now. In 20 years that Menard's will probably be long gone, replaced by a mixed-use development or something. Then some person who lived there will come back to show their kids where they grew up and they'll find an Amazon™ drone hub or a dark factory, where robots make self-driving cars without any human supervision or payroll overhead. Then when people stop leaving their homes altogether that'll close, too, and they'll build a building just to give the fully-automated construction robots something to do so one of the three trillionaires who own everything and everyone in the country can move a few million dollars from one shell corporation to another. And the construction robots will keep building useless buildings, and the demolition robots will keep demolishing them, and this will continue until the last one seizes up, and there won't be anyone left who knows how to fix them or make new ones, or even how to read, because they've all been turned into slaves who only know how to consume. And finally society will collapse completely, and for a few generations the handful of humans who are left will remember what it was to live like human beings before they eventually die, and humanity's light will be extinguished from the universe forever. And it will be as though we never existed.