Maybe they should look in Sacramento?

https://www.cnbc.com/2018/04/12/tengelmann-ceo-german-billionaire-missing-in-swiss-alps-for-five-days.html

Sorry, couldn't help myself.....

probably not going to end as well for this guy though as the avy danger is supposed to be really high in the Alps now if he was looking to disappear for personal reasons like the other wackadoodle I'd start by looking at an island he bought himself somewhere and they wont find him easily

I like the second theory better, specially if it involves Bond bad guys on skis kidnapping him and taking him to their secret mountain fortress. Woo ha ha.

Maybe his brother off’d him, look at the quote “things will run smoothly without him”