The Treasure Trove

1 chest and 1 backpack that can be purchased at vendors, which includes more than 15 of sets of weapons and armour split into three version of each to provide differing levels of power. - Rare (Dormant), Very Rare (Awakened), Legendary (Exalted). The main difference between is:
 
Dormant - Have 1 or 2 spells of between Levels 1-3. Have 1 or 2 passives per item. AC has been lowered on some items where they were previously increased. 
Awakened - Carry over spells & passives from Dormant version with 1 or 2 additional spells of level 3-5 and 1 or 2 additional passives.
Exalted - Carry over everything previously added with 1 or 2 high powered spells and 1 or 2 additional passives.
 
The sets include:

Cleric:
Stardust Armour Set, Shard of Moonlight (Spear), Blade of Moonlight (Longsword), Stardust Shield

Paladin:
Angelic Armour Set, Blade of Dawn (Longsword), Fist of Dawn (Mace), Radiant Justice (Greatsword)

Monk:
Elemental Unity Armour Set, Avatar of the Elements (Quarterstaff)

Druid:
Wildmother Armour Set, Wildmother's Staff (Staff), Wildmother's Blade (Scimitar)

Warlock:
Infernal Servant Armour Set, Infernal Servant's Rapier (Rapier)

Bard:
Storyteller Armour Set, Sharp Retort (Rapier), Crescendo (Violin), Lohse's Lute (Lute)

Sorcerer:
Stormweaver Armour Set, Raging Storm (Staff)

Barbarian:
Wild Temper Armour Set, Force Hammer (Warhammer), Magician's Judge (Greatsword)

Ranger:
Lone Strider Armour Set, Longshot (Longbow), Cloudshift (Heavy Crossbow)

Sharran Cleric:
Shade Daughter Armour Set

Rogue:
Shadow Mercy Armour Set, Shadow Piercer (dagger), Ice Shard (dagger), Slayers Blade (dagger), Slayers Crossbow (Light & Hand)

Fighter:
Blademaster Armour set

Wizard (Necromancy)
Necrosis robe, armour (alternative to robe but uses same stats), staff and ring

Githyanki:
Dragon Rider Armour Set, Dragon Blade (Greatsword)

Jaheira:
High Harper Set, Seedling (Scimitar), Sapling (Scimitar), Scorch (Scimitar)

Gale:
Waterdeep Armour Set

Cleric (Life)
Lathander's Protect Armour Set.

Paladin (Oathbreaker):
Oath Reaper Armour Set

Monk:
Steel Fist Armour Set

Monk/Fighter:
Pugilist Armour Set

Rings & Amulets:
Cantrip Slinger, Ring of Blaze, Ring of Frost, Ring of Lightning, Ring of Conjure Allies (Level 4, 8 & 12), Kareska's Amulet
 
Additionally, the chest includes alternative camp clothes, mostly taken from the Epilogue.
 
The Treasure Trove Chest can be found in the Tutorial Chest at the start of the game and (hopefully) at the following vendors:

Arron - Emerald Grove
The High Harper Quartermaster - Last Light Inn
Danthelon - Danthelon's Dancing Axe
 
Note: I'm very new to modding BG3 and you will find the icon for the chest armour for Wild Temper, Shade Daughter Robes and Lone Strider is different to the actual armour style in the game, I haven't figured out how to update the icon yet. The Shade Daughter Armour chest piece also looks different between female/male body types (on males it will be the normal Justiciar armour), i will try and update this at a later date.
 
Getting the chest to appear in shops:
I managed to get the chest to appear at the Last Light Inn, Harper Quartermaster. to do this, I went to load game, when you click on a character you may find some of them have a cog on the right hand side that says mods enable, some characters might not have this symbol. I used a character with the cog symbol, loaded a game save at the Last Light Inn, then took a long rest using camp supplies, left camp next morning and appeared back at the Last Light Inn and spoke to the Quartermaster, the Chest was at the top, it should have seventy-odd items included within it. I can't say with confidence that this will work every time. 
If it's not working, there is a mod somewhere that allows you to summon the Tutorial Chest, I suggest downloading that mod and you can access the chest that way.
Any issues please do let me know. This mod includes so many different items doing many things so there might be some hiccups here and there.