You haven't mentioned which Mac OS X version but if you remember the docs new name, press
⌘ spacebar to bring up the Spotlight window in the upper right hand side of your Macs screen (or just click on the Spyglass icon up there). Then type the name and press Return and the results will be displayed.
At the top of the results list it will say,
"Show All In Finder" ... select that and look for the Doc in the Finder window that opens and right-click or Ctrl + right-click it's name and select
"Open Enclosing Folder" and you should be right to go (in a perfect world
)