Dougal's ring has a skull and Dame Simonetta's ring has a spider. They are made from the same strange metal as the bullion, making it impossible to appraise their value. Your friendly DM will assume that our Heroes don't put on the rings (not even a little bit, just to try them on), without their explicit say-so.
Bilfur gives the contents of the scroll case a quick peek. It doesn't look like a spell scroll, more like historical documents or letters. There are two written languages: one language is English, and the other language is a runic alphabet that Bilfur doesn't recognize. Bilfur thinks it will take him at least 1 full turn to read the papers, and he will have to make a MYTHOS check, so he puts the scroll case away for now. He can study it at his leisure, on the surface.
The party has now fully searched the area. To recap the treasure found:
12 metal ingots
12 fanny packs
12 silver daggers
1 scroll case (Bilfur)
1 staff (Bilfur)
1 spider ring (Dame Simonetta)
1 skull ring (Dougal)
There's a slight logistical problem. To bring all this treasure back to the surface, the party is looking at an extra 60 pounds per person, just for the metal bars alone. Hobbets can carry 150lbs with a movement rate of 6", or up to 225lbs with a movement rate of 3". The strong party members (Bilfur, Willie, Wilbur) can carry 200lbs at 6" or 300lbs at 3".
If the party has a clever plan for efficiently carrying all this treasure (for example you figure out some way to carry or drag it cooperatively), then I might let you "cheat" a little on your max encumbrance, and exit the dungeon at 6" movement rate. But if there is no plan, and you are just stuffing loot in your pockets willy-nilly, then you're looking at 3" movement rate, which will double the number of wandering monster checks on your way back to the surface.
(As a footnote: If this were an all-races campaign, I would probably penalize a Hobbet's maximum encumbrance by 1 category. Hobbets weigh what, 30 or 40 pounds? It's crazy to think they can carry hundreds of pounds of loot through the dungeon. But for purposes of this all-Hobbet campaign, we will continue to hand-wave such things. Maybe we can imagine that "Hobbet pounds" are proportionately lighter than "Human pounds" and it all cancels out?)