It's been well over 2 years since I did this quest, but I'll see what I can remember...
Kelynn spawns in the slaver caves next to a wheelbarrow, by the 'back' moat entrance to the caves. His placeholder is a regular slave (always a wood elf, I seem to remember). The slaves depop and repop about every 20 minutes (I think... been a long time).
I'm pretty sure, having run the quest several times, that Kelynn is the next pop in that spot after you speak to the quest-giver behind the rogue guild in Kelethin (forget her name, sorry). Sooo... speak to the quest-giver, run through all the text, then run like heck to CB and sneak/hide around to the back (moat) entrance to the caves. The next pop beside the wheelbarrow should be Kelynn. Sneak/Hide up to him, drop Hide (but don't drop Sneak -- better chance of avoiding detection by other mobs) and make the turn-in.
I seem to remember that Kelynn will assist the orcs if you get aggro from any of them (so as to avoid blowing his cover, being a spy and all). Rondo spawns very close by and, yes, he's a complete pain in the backside. There's also a wandering orc who walks all the way up to the moat entrance every couple of minutes, but he can be easily avoided with a little careful timing. Do make sure you are clear of aggro before you make the hand in -- if an orc sees and attacks you, Kelynn will assist, and aggro'd mobs usually eat quest turn-ins without reward. If you get aggro, it's best to zone and come back straight away, so as to catch Kelynn before he despawns (and, yes, it is - or at least was - possible to train Kelynn to the zone and, if you're quick zoning out and back, catch him en route back to the slaver caves, clear of other orcs).
Hope that helps. :) Glad to see that people still do these quests. They were designed to teach rogues how to use their skills, but very few people seem to bother with them these days. :( Just remember that Kelynn is the next wheelbarrow spawn after talking to the quest-giver in Kelethin, so chat to her and then leg it to CB!
Edited, Sat Apr 24 16:40:27 2004 by jezh