Using the freeware utility FindFont you can identify all text elements in your DWG drawing which are using a given font (TrueType or SHX). E.g. for situations when AutoCAD complains that a font was not found but you don't know where is it used.
Download the FindFont application from Download, load it into AutoCAD using the APPLOAD command and run it by typing FINDFONT.
Enter a font name (or the filename of the .shx file), and the application searches the drawing for all font styles that use that font (plus texts written in that font), paragraph texts that switch to that font, and all other types of text objects that reference that font (including block references, tables, attributes and multileaders). Objects are identified both by listing their handle and by being grip-selected.
You can use the HANDENT command to select an object by specifying its handle.