There are two points to keep firmly in mind here.
- Free advice is worth every penny you pay for it.
- If it came directly from China, it's counterfeit.
That being said, there is a Purses Board on eBaydotCOM, that has several very knowledgeable contributors.
If you are in or near Toronto, Montreal or Vancouver there are actual outlets, which may be willing to authenticate it for you.
http://www.prada.com/en/store-locator.html
There may be others in Canada, the map is awkward to navigate.
If you take it into a store, be aware that they may have instructions to seize counterfeits, and that the police will likely be on their side.
