Inventory Not Updating (DataHash)

How is one supposed to know inventory is not updating?

Is one supposed to check computers randomly to verify the data?

Is one supposed to verify all the data?  If I'm verifying all the data, what is the point of the Inventory Solution?

The data hash problem described in this article can be found weekly with various client.  Is this normal?

http://www.symantec.com/business/support/index?page=content&id=TECH41180&actp=search&viewlocale=en_US&searchid=1411572925131

How can I rely on the data?

What is your experience with Inventory data?  Are you verifying accuracy?  If so, how do you ensure it is accurate.