Anything older then build 654 is missing as the links to them are no longer valid :O
http://www.shardstorm.com/zc/alphas/654-windows.zip
http://www.zelda.sjnetwork.net/alphabuilds/643-macosx-10-4.zip
Note the change in domain, I tried changing it to http://www.shardstorm.com/zc/alphas/643-macosx-10-4.zip but still didn't work :/ (Macosx 643 is just used as an example and 654 is when you transitioned to shardstorm storage)