The one on this merchant is "open_shop" (which does not allow you to turn off appraise checks); the other starts with "cs_ " something and has a variable it looks for to turn off appraise checks. We need to consider combining the two or just switching over to the 2nd one for this specific NPC.
I'll investigate this further, thanks for the info!
Also the funny way the area works is that the dragon statue is resized, but the 2da hit box is the same, which makes for strange behavior, I'll try a fix for it.
