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Reynash
Overview
Reynash can be found trying to pick the lock on a chest belonging to another Fist. Three other Flaming Fist, Manip Bakshi, Fist Debin, and Fist Oriona, are sleeping soundly in their beds while Reynash is busy with the lock on Bakshi's chest.
As he notices the party, he will nervously tell them to get out since the barracks are for Flaming Fist personnel only. By succeeding a Perception Check, the party can notice that he tries to conceal a lockpick while talking to them.
Interactions
Ratting him out
During dialogue, you have the option to wake up the guards in the room to alert them of the thievery. This can be done immediately, or at any later point in the dialogue.
Reynash will quickly run away, and Manip Bakshi will sleepily confront you about why you're in their barracks.
You need to pass a DC 10 Persuasion Check to convince him that Reynash was trying to steal from them; otherwise you will be arrested or attacked. If you pass the check, you will be peacefully escorted out of the room and gain 650 XP.
Find out about his stash
Through a DC 15 Intimidation or Persuasion Check, you can make Reynash admit to his crime, although he insists that he's no thief and intends to pay it back eventually. If you choose the Intimidation-based option, he will hand over his 
Thieves' Tools set at the end of dialogue.
At this point, you have the option to immediately blackmail him, which makes him tell you about the location of his hidden stash where he's storing the stolen goods. Several companions may disapprove of this choice.
Otherwise, inquiring him further about the reason he's been stealing leads him to explain that he needs gold to flee away on boat, since he doesn't feel fit to be a soldier.
If you tell him he "seems capable enough" or to "act like a soldier" he will simply end up walking away sulking and you won't gain anything. (Except, possibly, his Thieves' Tools set; see above.)
If you give him 
300 gp to help him flee, he will be grateful and reveal the spot of his stash willingly. Otherwise, you can also attempt a DC 15 Intimidation Check to gain the same information, though this may grant disapproval from several companions.
Note that the value of the items in his stash is much lower than the 300 gp you can gift Reynash.
Pick-Pocketing
You can pickpocket Reynash easily while he's busy with the chest he's trying to lockpick. (Ironic, isn't it?) Walk up to him while crouched to ensure you won't automatically start dialogue. You can also pickpocket him after dialogue, as he sits down on a nearby chair.
His inventory contains:
- 314 gp (or 614 gp if you gave him 300 gp)
Torch- Thieves' Tools (if not handed over to you)
Thief's Stash
The hidden stash whose location Reynash may reveal can also be found without his help. It's at the north-east corner of the rooftop, on a small lookout. It appears as a pile of building stones that reveal themselves to be an illusion once you pass an Investigation Check.
The contents are rather disappointing:
Altogether, the selling price of these items is only a fraction of the 300 gp you can pay Reynash to have the location revealed. The note found within also doesn't contain any useful information.