At work we mark items “As Is” in anticipation of our customers request of a discount for their keen eye’s noticing of the secondhand condition of the secondhand item that perhaps we had not considered when determining a price. Our determination process for the donated goods that come through the shop is one of my favorite aspects of how I spend much of my time at this place, perhaps it ought to be more systematic, but I like it as is.  The training for it is a bit like Japanese chicken sexing, I was a student of the process for five years, an item would be presented, the pricer may need to consult similar listings on ebay, but ultimately a certain vibe would be assessed and result in a number. The difference between a 165 item and a 175 was subtle, a calculation that was not immune to the forces of the day, the weather, breakfast, traffic, annoyance tax, etc. The Chick sexing technique known as Koumon-Kansatsu (vent inspection), experts examine a tiny bump (eminence) in the chick's anus (cloaca). Generally, a present, solid bump indicates a male, while a lack of a distinct bump indicates a female. It is a, highly specialized skill involving physical manipulation of the chick’s tail feathers to open the vent. Trainees would handle thousands of chicks, making a guess, while an expert provides immediate "yes" or "no" feedback. Early training courses, such as those at the Zen-Nippon Chick Sexing School in Japan, often lasted two years to reach professional proficiency (approx. 800–1200 chicks/day). The skill is highly intuitive; experts often cannot explain how they distinguish the gender, having internalized the subtle visual differences through rigorous, repeated experience.