I have gotten a few tier 4 rares here you can farm them solo (well I could as a crappy guardian at lvl 40) although some of the groups of Savages are greyed out to me. The mob groups you want are Centurions (found on the road) and Savages (found off the road) in that area. The savages and centurions only spawn during day and have placeholders at night (or vice versa I cant remember). A nice way to farm it if you are unsure doing it solo and/or the mobs are greyed out to you is to grab a partner who is lvl 30 if you are 40++. Just send a tell to some lvl 30-34 player and say 'Hey do you want to DUO farm tier 4 rares like feysteel and high qual pelts'. 80 percent of time most come to join me. I have never gotten a steel chest (master chest or whatever you wanna call it) But I have gotten rare harvest items (Like shaman medicine bags = HQ pelt, Feysteel goblet = feysteel cluster, etc).
Another mob to check that is pretty easy if you are farming this zone and you clear out all the Savages and Centurions is Terkus the raidleader. He is located east of the outpost (the docks/zone in). As you are leaving the docks/outpost make a right/east and go past the Tallon Warpriests etc he is way in the back behind them. I cant remember the formal name of this area. A nice little trick to check if he is up is to use the old 'miniscouting' trick (do a /hug terkus) while you are over near 3 toes lake farming the Savages and Centurions.
Here is a link for a loot table to the Savages (Centurions are the same loot table from my experience but Centurions seem to drop more Rare harvests)
http://eq2.ogaming.com/db/bestiary/AVallonSavage.phpAs a guardian I didnt get hit a lot or take a lot of dmg but my dmg output is severely lacking and the battles took a while. I just got bored with the camp but it is a fine area to make some money.