I didn't read everything on the page you provided but I did read that Husni was chairman of Sphinx Tours from 1966-

I'm sure I missed it but where does it say the Sphinx Tours started in 1966

Also in the page you provided it says Sphinx Tours is Alexandria, New York, Los Angeles.

The coaster lists Alexandria, Paris, New York. Maybe the coaster is from an earlier time than the post 1966 Los Angeles lusting?

Lastly, when a matchbook is found, not even with the chips, we tend to use it as major proof on an attribution. The only reason to dismiss the coaster is if they did not come together.

Bottom line is I'll keep them as Cali. But I'm just not that convinced