Indeed, there are several examples of museum janitors from present day removing a portion of (or the whole) art thought to be trash.
http://news.bbc.co.uk/2/hi/entertainment/3604278.stm
http://www.powerlineblog.com/archives/2011/11/swept-away.php
Dane did not even come over to NZ from his residence in Berlin, or send any artwork to the competition. He simply phoned in instructions to the janitor to wait until all the other exhibits had been prepared and their packing and scraps had been cleaned up, and then told the janitor to empty the contents of the rubbish bin and enter it as his sculpture :-)