Use the search option in the following way to find the "Bold" values.
1. Ctrl+F
2. Leave the keyword (search) item empty
3. Expand the options field
4. Click the "Format" option; from the list, select "Format"
5. In the opened pop-up, go to "Font" page
6. Select "Font style" option as "Bold" and click "Ok"
7. Now click "Find" (Search) button in the search window
8. Expand the search window by click and drag the bottom right corner
9. Now you can find the location and the content which are in bold in the selected sheet.
Wishes..!