To refresh your Sold comments, go to your Listings page.  Click the Sold Comments tab.  This will take you to a page where you can click the blue button to Refresh All Sold Comments.  Be aware you are limited to clicking this button only once per hour.  It may take some time for the system to work with the Facebook system to scan your albums and retrieve the Sold comments.  Once they have been pulled, you will be able to see a Sold Comments Report on your Refresh Comments page.  You can also go to your Listings page, under the Manual tab, and click the Facebook Comments header.  This will bring your items with Sold comments to the top.