Ok the first type of spawner I downloaded was the premium spawner (because it looked the easiest to use). This spawner claimed to be able to spawn all those treasure boxes in the dungeons as well as rare items. So I spawned the facets I wanted to use and had limited success. The chests in the dungeons are there, but they're all empty. Some of the rare spawns are there (like the fruit baskets) but others like semi-rares you'd steal from a box aren't there. Is there a command to use (either with premium or with xmlspawner) to spawn these chests and other containers to have all the stuff inside them and be locked like on the OSI servers?

If not, how would you suggest I go abouts adding these locked chests in the dungeons. Keep in mind I've added a few other spawners here and there that I really don't want to have to go and redo if I don't have to. If it comes to that ok

Also, I read the beginners tutorial which shows how to add a chest full of loot. (very cool btw) but it doesn't show how to lock this chest. It also lists the loot type as superboss or something, but is there a list of other types of loot?

if you want prefilled treasure chests, just add the scripts found in this post and spawn them as instructed.
http://xmlspawner.15.forumer.com/index.php?act=ST&f=6&t=622

If you want to spawn chests filled with lootpacks such as superboss, the available lootpacks are

poor
meager
average
rich
filthyrich
ultrarich
superboss

see this post for more types of special loot
http://xmlspawner.15.forumer.com/index.php?showtopic=116

You can find scripts for stealable rares here
http://xmlspawner.15.forumer.com/index.php?showtopic=74

Right on Arte thank you!