>>Arjuna+V1
Interestingly, try navigating through – here's the link to page 14: https://www.google.com/?tbm=pts&gws_rd=ssl#q=inassignee%3A%2.... I remember reading or being told that Google only estimates how many results there are, and refines the estimate as you navigate further down the list. As of page 14 there seem to be only 133 results; a far cry from 6,430.
>>peter_+y3
Apparently they don't estimate, they inflate how many results there are... For example, I never seen a case when their "estimate" was lower then the actual number of results.
>>Istof+L8
An upper bound is a valid estimation. "Inflating" assumes that they have a good approximation, and that they arbitrarily increase it. I don't think that they do that.