Holy cow, I wrote a book!
A customer wanted to know why some of their users showed
network servers among the locations shown in the Recycle Bin
Answer: Because those users are using Folder Redirection.
if you redirect the My Documents folder,
then a network Recycle Bin location is created to hold the files
deleted from My Documents.
The Recycle Bin folder in the user interface shows the union of
all the recycled files in the individual Recycle Bin locations.