In the mean time, you can set the search options to "Only show matching files", enter you search string, then start moving the layer shade backwards (Command-up arrow). The lost file should appear pretty quickly.
That's exactly how I do it now but when you have > 50 layers, it isn't so "quickly"
It would be nice to have an option to automatically open all disclosures to show the matching files rather than having to do so by hand which can take awhile.
Even better, it would be nice to have an option that shows the filename in 1 column and the path in another column so one doesn't have to deal with the disclosures at all during a search.
Regards,
Wayne