They could have kept quite until someone else noticed but reported over chat to the gods and did not keep quite and claim as many rewards as he could until the gods noticed or it was reported!
Honesty like this should be rewarded. Maybe just a piece of unique deco, a scroll labeled "thanks from the gods" and for reporting a very serious abuse maybe something like one item blessed for free by the gods.
Maybe the same for bugs found in game or on test server (i assume you have one), a scroll or shrunken solen ant labeled " "insert players name" found a bug!"
This would only apply to the first player to report and if its not already known.
(I am new here so if this has been suggested before or if it is already in place ignore all i just wrote

Midge