Someone did one of those seal some art in a weather proof bag, leave it somewhere public (outside my shop). A customer noticed the art but did not look closely enough to realize that it was abandoned intentionally and that she could keep it, instead turning it into a staff member for the lost and found. Staff member also didn't look at this closely enough to realize nobody is going to claim that. I'd contact the artist, but I'm not on any of the listed contact platforms that don't do interop.