tahoeblue
1056
Keep the certificate with the watch.
Don't worry whether your info is on it.
I agree with comments that the box and papers are not essential to buy or sell a nice watch--the important issue is the condition of the watch. Frankly the boxes are a nusiance to store (though I keep all my original boxes), and I never look at the papers--they come in handy only when buying or selling. But if do you have the original papers, keep them with the watch. This will be good for you in terms of your sales price and good for further future owners. I would not worry whether your name and address are on the certificate. Don't alter it by whiting anything out.
In the future when you buy a watch from your Patek dealer, ask him to keep the certificate open (though they most likely won't want to do this). Alternatively, ask them to just include your name and not address if this is a concern (that should be no problem).