Way I did it was to team-up with everyone in the zone (like, everyone, capped alliance) and everyone works together on their prowesses. If you claim that mob, the subsequent chest is yours. In 8 hours there was ONE instance where 2 people argued over who the chest belonged to, so they randomed and the winner for a Pro-Ether ^.^
Got Lv5 Chest in about 2 hours this way, as well as a plethora of other shit. Seriously, teaming up to farm Prowesses is the way to go, but I also agree that the idiots who leave blue chests up or don't empty brown chests seriously skew other people and themselves. Already for that temp item, toss it. Don't need that Elixer, get it and toss it, or better still, use it.
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