His car and wallet are at his home. He might have had cash and a credit/ATM card in his pocket. Did he take his house keys? I often take only keys and cash when I meet friends in San Francisco. I also take a "throw away" wallet in case I get robbed, and leave my "real wallet" at home.
Phone robbery is a possibility, it has happened around here. The shoe photo on Facebook is interesting. Is this provocative shoe a robbery temptation?
He's not around which suggests he left in a friend's vehicle, a non-friend's vehicle, a bus or BART. BART has cameras at the stations but many fake cameras on the trains. SFMTA Muni and samTrans usually have cameras on the buses but they aren't always functional. Someone should check the transit cameras. And, if the phone is working, the phone. The phone carrier should be able to give an account of recent activity.
The timeline is fairly tight (about 14 hours) so there's not a lot of material that needs to be checked.
TRANSIT CONTACT INFO
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samTrans
Bus - ECR Daly City BART
http://www.samtrans.com
SamTrans Customer Service
(Weekdays: 7 am - 7 pm / Weekends & Holidays: 8 am - 5 pm)
1-800-660-4287
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SFMTA Muni
Bus - 28 North Point + Van Ness
https://www.sfmta.com/getting-around/transit
Phone us 24/7/366: dial 311 (415.701.2311 outside SF)
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BART
Millbrae Station
BART Police
Non-emergency 877 679-7000