The Sandvich Box code isn't in a lot of those, and I think I only saw one sale with both the code and RL Sandvich. Also, pricing based on ebay is like citing a porn website for a paper in a health class. Definitely not the most reliable source.

Also, cash trades are different, with different price ranges. People normally sell for less in cash if they need the money, so it's difficult and, in most cases, incorrect to base prices off of that.