I didn't receive authenticity certificate nor warranty. The seller wrote this when I asked him if the watch is authentic:

"Please be rest assured, it is the authentic product, we could sell at a low price as we purchase our goods from the factory directly. Please feel free to contact us if you have any problem."

When I asked him about the certificates, he wrote:

"We are sorry to hear that. Maybe it is a carelessness when packing since the dispatch dept have so many orders to deal with..."