Laenis posted this on the Rogue forum on the official WoW site:
Hi, since it's been asked so many times I was hoping to compile a list of what items require what skill in lockpick and when they become trivial. This is still not complete, I NEED input from everyone. Hopefully this helps everyone, once more, I need more input to make this complete!
As a note:
YOU DO NOT GET SKILLUPS FROM LOCKPICKING OTHER PEOPLE'S BOXES ON THE "WILL NOT BE TRADED SLOT"
Pickpocketted stuff: (To find out which mobs give what from PP: www.thottbot.com
Battered Junkbox (Orange: 25? Trivial: 100?)
Worn Junkbox (Orange: 100? Trivial: 175)
Sturdy Junkbox (orange: 175 Trivial: 250?)
Heavy Junkbox (Orange: 250 Trivial: never?)
Heavy Bronze Lockbox
Ornate Bronze Lockbox
Iron Lockbox (Orange: 80? Trivial:???)
Strong Iron Lockbox (Orange: 130)
Steel Lockbox (orange: 175 trivial: ???)
Reinforced Steel Lockbox (Orange: 225 Trivial: never)
Mithril Lockbox (Orange: 225 Trivial: never)
Thorium Lockbox (Orange: 225 Trivial: never)
Gnomeregan (Orange: 150? Green: 200)
Scarlet Monastery (Orange: 185 Green: 226 Trivial:???)
(see notes 3)
Searing Gorge Gate (~225-230 skill) (2 guaranteed skill ups, but on timers.)
BRD (Orange: 280 Trivial: hah.)
Scholoman (Orange: 280 Trivial: good joke.)
Insta-chests from respective lockpicking quests (orange: 1 trivial: 105)
Main chest in lockpicking quest (orange: 75/80? trivial: 175)
Klaven's tower chest (orange: 90 trivial: 175) (see 1 below in notes section)
Engineered Practice Locks (Green: 1 Trivial: 75) (You can only pick these ONCE, so they are WORTHLESS)
Links for lockpicking quests with respective insta-chests:
Quick theoretical notes NOT TESTED: (Need confirmation on this)
Confirmed Lockpicking Information: (READ THIS)
1. When you want to pick lock a door, if you PP a junkbox between successes (not just skillups) at the door, it will allow multiple skillups at the door. (ie. pick door (get it open), pick junkbox (skillup/noskillup), pick door(possible skillup again).) (this is very useful in scarlet monastery)
Quick lockpick skillup guide:
(or how Melgrave got so high on Lockpicking and Laenis copy/pasted his guide and modified it =P)
NOTE: You get the Pick Lock skill at level 16 from a rogue trainer high enough to give it. You get 5 points of lockpicking per level. (ie. 225 lockpicking is achieved when you hit level 45)
1-103 on the Insta-chests from lockpicking quest.
I recomend running through a "private" Stockades instance when level 30 or so (less with MoD) and PPing 2 bags full of lockboxes.
103-175 very tediously between pickpocketted lockboxes and Klaven's tower.
Desolace is good at late 30s for the undead ravagers also drop mageweave (yummy!)
175-178 on the Gnomeregan doors (I suggest you learn how to reset an instance, see notes 2)
179-184 on Scarlet Monastery doors/chests
Haunted recomends that at 175 skill, the best thing to do is wait until you're level 45-50 and pickpocket either the ogres in Tanaris while grinding, or pickpocket Zul'Farrak and resetting the instance (about 5-6 junkboxes per run average.)
1. I just did this at 39, go to Westfall to where the poison quest is at, top floor, Klaven can take me down to half health at 39 if I don't dual-ambush so he kinda hurts. Hopefully you can also be outside his aggro range to practice. To do this just go behind his table, there should be two chairs, jump over the chair closest to the chest and from behind the chair pick the lock (you MUST click on your lockpicking icon then the chest). Don't worry about Touch of Zanzil, a death(*) or Jungle Remedy from STV or cure poison from a high enough player should make it all good.
You must be of a high enough level not to aggro Klaven!
*: for extra points see how many mobs you can pull and tank at the same time in Westfall without dying or killing any, my record is 25 (without using evasion)
2. Easiest way to reset an instance is to have a buddy help you:
Enter instance solo.
Invite buddy to group.
*BIG CAP WARNING* ***DANGER*** ***ALERT*** ****TOLD YOU SO**** DO NOT LEAVE GROUP BEFORE LEAVING INSTANCE, THIS WILL BUG YOUR INSTANCE AND YOU WILL NOT BE ABLE TO WALK BACK IN FOR ABOUT 30 MINUTES.
Once you're done doing your dirty deeds with sheep in the instance, leave the instance while grouped.
Once outside, leave the group and re-enter solo.
3. You can skill up 8 times on the doors to SM, there are 4 doors, 2 inside instances and 2 outside. They can be picked from both directions though so each count as 2.
(SEE INFORMATION 1 ABOVE)
Library: Chest in a cubby before the Gallery of Treasures, guarded by 3 mobs. Another chest that spawns in one of the hallways close to Doan himself, guarded by typically 2 mobs + one roamer.
Armory: Chest either in the Training Grounds (guarded by 2 mobs + 1 roamer) or inside the first part of the armory (guarded by 2 mobs + 1 roamer.) Can't remember location of other chest off the top of my head.
Cathedral: Chest on either the left or right side of the fountain. Another chest that spawns either by the monk guarding Fairbanks' hiding spot, or spawns on the other side of the cathedral (guarded by 3 mobs + 2 that roam close but may or may not aggro.)