Hi,
I'm afraid I have no knowledge about professional glass repairs other than thinking that it would be fairly expensive. I wouldn't imagine Baccarat would offer this service, but if they do they'll charge a premium plus transportation and insurance. In your shoes I'd get some idea of value first and then consider whether to get the chip ground out or cosmetically repaired nearer home.
Probably the best place to look for a replacement lid and drip catcher is on French websites. Try seeking advice from French perfume bottle collectors or even Caron themselves (they seem to have lots of urns so may have spares or may be able to direct you in the right direction) If you're emailing France, try using Google translate or other online translation software as this will probably improve your chances of help. Best of luck.
Kind regards
Nick