If you are trying to find a specific kind of randomly generated magical item from treasure chests, below is a brief breakdown of what sort of armor, weapons, and shields are associated with each theme. Note that some items may be missing just because I haven't come across them yet or seen anyone else post them as being from a specific type of chest. Also note that some items seem to be specific to certain facets, e.g., gargish glasses in Ter Mur, bokutos and samurai or ninja armor in Tokuno, whips in Eodon, etc. From what I understand, Ilshenar maps can be a good possibility if you're looking for properties you'd normally only find from Ter Mur treasure chests.
ARTISAN
Armor: Cloth hats, including flower garlands but excluding bandanas, tricorne hats, and wizard hats; elven and gargish glasses; circlets, gemmed circlets, royal circlets.
Weapons: Axes, hammer picks, hatchets, pickaxes, smith's hammers, sledgehammers, war hammers.
Shields: None.
ASSASSIN
Armor: Bandanas; leather samurai armor; leather ninja armor; chainmail armor; ringmail armor.
Weapons: Assassin spikes, bone harvester, cleavers, cutlasses, daggers, double bladed staffs, elven machetes, elven spellblades, kamas, katanas, krysses and gargish krysses, leafblades, rune blades, scythes, tekagi and gargish tekagi, whips.
Shields: None.
MAGE
Armor: Wizard's hats, bone helmets, gargish cloth armor, leaf armor, leather armor. (Note: I am guessing other pieces of bone armor spawn in mage chests, but am not sure about this. Also, there seems to be a possibility that at some point Mage chests dug up in Ter Mur might include cloth wing armor which has properties on it.)
Weapons: Black staffs, crooks, glass staffs, gnarled staffs and gargish gnarled staffs, quarter staffs, scepters, serpentstone staffs, wild staffs. (Note: Most of the time, these weapons do not have spell channeling as a property.)
Shields: None.
RANGER
Armor: Gargish leather armor, hide armor, studded leather armor, studded leather samurai armor, wooden armor. (Note: There seems to be a possibility that at some point Ranger chests dug up in Ter Mur might include leather wing armor which has properties on it.)
Weapons: Bows, composite bows, crossbows, elven composite longbows, heavy crossbows, magical shortbows, yumis, butcher knives, skinning knives, boomerangs, cyclones, soul glaives.
Shields: None.
WARRIOR
Armor: Tricorne hats, metal helmets, dragon scale armor, platemail and gargish platemail armor, platemail samurai armor, stone armor.
Weapons: Bardiches, bloodblade, bokutos, broadswords, clubs, disc maces, gargish daisho, gargish talwars, halberds, longswords, maces, mauls, pikes, pitchforks, scimitars, short spears, viking swords, war forks, war maces, stone war swords.
Shields: Yes.