location of imported files

When no folder is selected, and a file is imported, where does it go?

I can find these imported items by searching for them, but the Info panel shows they have no tags. They do not appear in the Inbox.

They go into the root level of the database. One way to view items at the root level is to select the Three Pane view and click in the group list pane in a blank (no group selected) area. All files in root will display in the document list pane.