It's possible they could be called up to retrieve the specifications and possibly the mold. It's not necessarily the case that they've destroyed or lost track of them. Notwithstanding that, it's a vacuum vessel, there are only so many ways the gasket could be designed. I'm not qualified to design a part like that, but surely there are many people who are.
Due to the mergers/acquisitions involved over the years, it's entirely possible that Philips doesn't even know exactly where their current stock came from. While I certainly believe they could be of more help than they have been, I also think people are massively underestimating how hard it might be for them to do so.