Not to worry though, Their are Ways still of Stealing successfully even when at only 50 Skill Level.
So I only carry my newbie cloths, 3 Lockpicks, my newbie dagger, spell book, 3 garlic and 3 Ginsing (to cast heal for the Posion traps) and 2 spare packs. 1 pack has the 3 picks and the cure reagents in it. The other is a "Hot sell bag" (UO Assist Function) when I steal non rares from shops I always sell them to the shop keeps on my way out, so they go into that one bag.
When I do die, if some Lamer loots my Body all he is going to get is about 50 gold worth of stuff.
The nice thing about having all the items in 2 bags is it saves drastically on pickup time in between deaths.
The first several times I died as a thief I would be their picking up 8 or 9 lockpicks, several regents, food, a pitcher, gold, cloths, etc...
It either took to long, or someone stole it before I got back, so I learned 2 packs, nothing of value.
When you are still at the lower levels if you steal a rare from the in town chests GO BANK IT. Then come back for other rares. Otherwise you will just Die with rares on you, and it will burn your britches even harder when you get back to find the item you have waited 30 minutes for has been stolen from you! :)
I know that should be obvious, but from the amount of time we as thieves Die I think its not Obvious and it wouldn't hurt to read it a few hundred times lol.
Im not certain what the differences are in walls as far as the computer is concerned but it sees them differently than we do as players.
So for in town spawns try and pick your spots for several factors.
Mine are:
1-Amount of Crates/barrels to steal fromMost thieves only look at the amount of items to steal. Because of that they miss out on a lot of Choice loot.