I will not comment on this business because they may honestly believe it is real. But they are so very very wrong.
OK. Lilac.... even 80 or 100 years ago there was no lilac essential oil or absolute. it all comes from terpineol which smells remarkably like lilac, though really good reproductions would probably contain blends of real florals like ylang ylang, jasmine and tuberose... but no real lilac.
Ambergris is insanely expensive. I have some I had shipped from Italy. So unless you dropped a few hundred bucks that is a no. However, there are some really really great synthetics so don't feel bad. Musk is not legal, though I have smelled the real thing (from Italy) and you can sometimes find the musk grains in Chinatown but again... fake.
Civit is virtually all synthetic, though the real stuff is available but due to protests from US groups no one will usually sell it. But it is theoretically real, but in most cases... no.
I only know these obscure things because I know a number of professional perfumers and have visited them at their labs, and I used to have a few huge lilac bushes and have sincerely wished I could get the real thing too.