FontDoctor stores quarantined files in a private folder so they dont get lost or misplaced. The Quarantine panel provides an easy way to restore quarantined font files back to their original locations at any time. To restore a font file, click the checkbox next to the font file name in the list. When a file is checked in the list, the Restore button becomes enabled. Click the Restore button to restore the font files.
To select a different folder to restore the font files into (other than the original font file folder), hold down the Option key then click the Restore button. This will present the select folder dialog window. Choose the folder you want to restore the fonts into to finish.
Lastly, if you want to see the actual Quarantined font files folder you can do this:
1. Launch FontDoctor and open the AutoScan settings window.
2. In the AutoScan settings window there is a small gear icon button at the bottom of the window. Hold down the Option and Shift keys and click that button. You should see an “Advanced Settings” menu item. Select that.
3. In the Advanced Settings window, click the "Show Quarantine Folder" button.