Puzzle Making, Making me crazy

So there is a huge contest with PayPerPost to find 192 puzzle pieces for an 800 X 600 image promoting the next PayPerPost marketing campaign. It looks like they have got themselves a sweet truck to take from place to place to promot PayPerPost. Getting out on the road to search for the Posties who can promote PayPerPost and the opportunities whithin. I have been trying to put together this puzzle all day practically and have 20 pieces left to find. I can’t seem to find pieces 41, 42, 46, 54, 60, 61, 73, 76, 77, 78, 92, 100, 107, 128, 131, 145, 162, 168, 182, and 190. And it is driving me nuts.

Here is what I have so far.