Just received my dollars for my planned trip from the UK and noticed that the notes are all a new style from the last time I visited the US 3 years ago. The notes are different colours for each denomination and are a different design from the ones I brought back from Las Vegas. So can these old notes still be used or do I have to take them to a bank when we arrive in the US. Would a casino cage exchange them? Do they work in the machines? These notes would have been in general use in Aug 2009. Then again it might be just that they are new and the ones in my old wallet are well used.....???