Ok, now i understand.
It is unfortunately something common, some people seem happy to show nice faked stats. Usually these guys are well known in their local community and do not dare to show up at events. Nobody gives them value.
This is a groundspeak related issue as the guidelines state that a logbook must have been physically signed. I suggest that you contact the COs of the caches involved, inform them about the possible fake (with a proof) and request for log deletion. You could even post a request for maintenance and indicate that the log book must be checked, but this is extreme it is always better to first contact the CO directly. If it does not work, you can contact groundspeak using the contact form on their site. There is a drop box item for the category that is about violations.