If I've worn a ring of the mouse long enough to know its bonuses to dex and stealth, but not long enough to know the negatives to prowess, the shop uses the good bits that are partially ID'd in their valuation, so they offer over 2K instead of the normal ~80. I'm guessing this is a more general problem with valuation, probably tied to the logic that would handle things like rings of strength that could potentially have negative bonuses. In this case though, it is wide open to abuse since rings of the mouse will (almost?) always have a big negative.
One possible fix might be for the shopkeep to model the expected value of the item based on "generating" a few items of the same type with any known brands/egos filled in and then discounting the value.
One possible fix might be for the shopkeep to model the expected value of the item based on "generating" a few items of the same type with any known brands/egos filled in and then discounting the value.
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