Ever find a copy of something and wonder where you got it from? It can happen to anyone. And even if we know now to track all our sources, most of us researched for at least a while before we came to appreciate the importance of tracking where our information originated (for how can we compare and evaluate if we have no idea of the original source?).Even if we keep track of everything we get, a relative can easily send us something and have no idea where they got it. An older article on our site discusses such situations and some ways for determining where a document really came from.
We called it Orphaned Papers.