When you say "system status", does that mean the admin console/dashboard, or do your mean App Engine's general status page at
https://code.google.com/status/appengine ?
Try looking at both the classic App Engine console at
appspot.com and the new console located at
cloud.google.com/console for your application. If you still don't see your application ID, try checking any other Google accounts you have - you might be logged into the wrong account.
If all else fails, you can try filing a ticket to find out the account owner, although I'm not sure support will give that information out. Consider abandoning that application and creating a new app ID then re-uploading your code - there's really no need to reuse app ids when you can just get another.