Thanks for your suggestion, my comments:-

1. As you aware, there are a lot of new sales thread everyday in Garage Sales. It increases the burden of moderators unnecessarily. How many mods are willing to check so many threads voluntarily?

2. While the moderating team is trying their best to reduce con cases, the responsibility is always between the sellers and buyers, not the moderators. Requiring moderators to judge each and every thread is like transferring the responsibility from traders to moderators. Traders should practice more common sense and judgment, instead of being spoonfed too much. Trade Zone is meant to be a free trading area with minimal moderators intervention

3. While it may be able to detect some fraud cases, it also brings undesired inconvenience to majority of the traders who are safe, hence I don't see it as a feasible implementation.

You may, if you think there's nothing more for you to bring up.