In the 1960s and 1970s art philosopher Arthur Danto wrote a series of articles examining the claim of found objects presented as art to be art rather than simply objects.
From his 1974 article “The Transfiguration of the Commonplace”, “I think of the singular intoxication the first pop-art exhibits brought to spectators when they saw such crass objects as ironing boards and vacuum cleaners in a space where they no longer had any power over us, standing helpless and impotent like stranded sea monsters, in the neutralising space of the gallery.” link
Commodity Sculpture was a descendant of Objet Trouve popular in the 1980s
Found art comes in many forms. See Haiku by a Robot.
Sometimes found objects turn out to have be not-so-found. See Horse_ebooks
via Objet Trouve.