Originally Posted by saarn
you've still got the knowledge leak problem [...] What about having anything that is only partially ID'd sell at the lesser of price based on known properties and price if it were not at all ID'd?
I wasn't too concerned about the knowledge leakage in that direction since so few things are cursed any more. But I like this suggestion even more: a "partially" ID'd item counts the same as an un-ID'd one. The shopkeeper could even give a snide comment along with the low price to help the newbie understand why they're being offered so little.