Having unfortunately purchased a fake Chloe paddington when I knew nothing about Chloe, I had some pictures around that I thought would make a great guide.
So here is a fake off white paddington, compared to an authentic Brun 07 Chloe Paddington.
First up - the way the bag sits.
Authentic Chloes tend to puddle a little - the padlock falls into a nice comfy cushion of leather. The Brun paddy is an 07 so it's not the smooshiest of paddingtons but you can see the difference between it and the fake when both sit empty.
You can also see in this picture the different in the "Chloe" heatstamp on the padlock - notice how it is petite on the authentic bag but takes up a lot more space on the fake and almost looks as if it is in bold font. The fake imprint is much deeper than the stamp on the authentic padlock.
Another thing to note is the placement of the stitching - on an authentic bag it's right up near the edge of the leather, on the fake you can see it's almost in the middle, the spacing is all wrong.