You might want to clarify this before picking it up. If he charged you for a 2009, but it is a 2006, the bikes are totally different. The only thing the same is the name, general shape and how fun they are to ride. It might get some $$$ refunded back to you for falsely representing the merchandise.
The easiest way to tell if you have a 2006 or 2009, is to look at the front wheel. If it has two disks for the front brakes, you have a 2009. If it has only one, you have a 2006 or earlier model.