Doing a quick check I didn't find any contributions I didn't previously know about. I did find that I'm still attributed for a contribution I made to one project over five years ago.

That project has since gone through several revisions and a new major release which has itself had several revisions. They keep a detailed changelog, though, and credit people who made contributions there. It's something I as a contributor really appreciate.

One thing I've noticed is how hard it can be to use open source contributions to minor projects on a resumé or in a portfolio. There are a number of projects I've made contributions to that have ceased distribution. There's usually no fault there, since so many projects overlap and so many people lose free time or lose interest. Other projects, though, seem to time out attributions in their credits and even their changelogs, which is both illegal and wrong as far as I can tell. Besides being a neat find, perhaps these found attributions can help someone's career or help build a client list.