It's pretty much the same as in all the guild stuff we do.
Rule 1: Don't be a dick, that's pretty much it and all that ever needs to be.
If there are upgrades by all means grab them use them, and if it's a pretty good leveling item then yeah toss it back when you are done so someone else can do the same.
Likewise if there is something you need that isn't in there feel free to ask.
Right now it's an unorganized mess, I am gonna hop on discord in a bit this evening maybe someone can help me straighten it up. There is a lot of shit in there that probably needs to be dusted. There are a lot of multiple Uniques that don't fit in the tab that might be better off being traded for 1 Ex or some shit.
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Overall the guild chat kinda blows in the game which is why I try and get more people to ask for things via discord when it comes to items, help, trials, whatever.
Happy Hunting.