Assuming that the scratches are hairlines, no major damage on the case, and the watch will come with full warranty from Patek:
- To me, the condition shouldn't be a big deal. White gold is soft and you'll have the same hairlines after wearing it a couple of times. I'm assuming that you want to wear the watch.
- If the watch is not keeping time well, you can always use the warranty to service it afterwards.
- I would concentrate my efforts in obtaining a good price from the dealer.
Just my 2 cents.
Good luck and keep us posted! 😉