We have started adding employee documents to the repository and HR would like a way to see if any basic documents that have not been added to an employee's file, like a W4. 

I am not good with Syntax yet so I am not sure if there is a way to do that through Syntax but my best attempt so far would be to Tag an Employee File with every document type and have Workflow remove the Tag as the proper documentation has been added, the biggest issue is if we start adding more documents older employees files would have the newer tags assigned. 

What do you think the best approach to this issue would be?