Wrebbit 'Puzz 3D' puzzle of New York City, $3.

This big box was sitting at the yard sale right out in the open all morning, and nobody caught on to its significance. Look at the picture on the front and see if you can spot two tall buildings that aren't around any longer. That's right - there's the World Trade Center right there on the front of the box. Although it may seem morbid, there's a very strong collector interest in some things associated with the World Trade Center.

The most important thing for you to know about World Trade Center collectibles is that countless 'collectibles' have been produced since the Twin Towers were destroyed. That's right - no sooner had the Towers fallen than countless posters, flags, signs, mugs, and just about anything you can think of started being pumped out to commemorate the buildings. The problem is that people aren't after this stuff because there's no element of scarcity to it. Why would a collector be after anything that has the potential to be produced in unlimited quantities?

The really collectible World Trade Center items are those made before 9-11, where the Twin Towers appear, but aren't necessarily the center of attention. An example of what I mean can be found in movie posters for Superman II, Spiderman and King Kong, where the Towers appear, but aren't particularly accentuated. Notice that this Puzz 3D makes no mention of the WTC, even though there it is, right on the front of the box. This is what the collectors want!     

An obvious concern can be seen right on the top of the box: 3141 pieces! Should you count all the pieces? Well, that's up to you. I'd settle for just having the seller assure me that the thing had never been assembled.

This New York Puzz-3D puzzle sold on eBay for $115