No worries @aem_party , thanks for further explanation. I think I understand your use case now, but I also think we're not using the correct terminology ('saved') which is causing the confusion.
When a blank CF is created, it is in a 'saved' state.
Maybe what you're after are the CFs which are not empty? If thats the case then maybe you can look under the 'elements' property for a property (say, 'value' correpsonding to a CF field) if its empty or has a value.

Or maybe you are after the CFs that are not 'finalised' yet, meaning the author user is still working on it and hasn't finished writing it up. This would be tricky, as it more sounds like a business process rather than product. However I do see a property in CRX which seems to exists for a newly created CF only. But I don't see it in coming in assets API:

If you're lookiong for the CF that is published (which I suppose also indicates that the CF is 'finalised'), then you can look for the published property:
