This is a very untimely response... BUT...
Yahoo! closing its auction site was one of the reasons that we created Repatoo. So, for the last few months we have been slowly but surely importing feedback details from the site.
Go to the beta site and search under your Yahoo ID and click on feedback details and you should see all of your feedback details there, which we will keep for you indefinitely.
Once you have set up and account you can generate links that will let you reference your feedback profiles (eBay, Yahoo, Amazon, eCrater, eBid, etc) from one location.