We have a user that asked the eblow question. They are referring to Box Drive folders that have been marked for offline use, as well as those in the cloud:

"I would like to see improvements in the Box Search capability within Windows Explorer. You cannot execute a search across sub folders within your Box Drive folder structure, only within the currently viewed folder. If I know what folder a file was in I have eliminated 90% of the reasons I need to search. I get the same search limitations for Cloud based folders and folders saved offline to my desktop.

I understand a search for those saved to my desktop would certainly be easier to program as it could use the native Explorer search in the referenced local drive, but this also does not dig any deeper into the folder structure."