Rant

Dear whoever:

Should you ever for any reason (god forbid) be in a situation where you are posting an "Anyone with any information about {X}, please let me know" message in a public forum:

list their last name

list their first name

list their address

if you can't, list the nearest intersection, section of the city, zip code, or what have you

failing that, mention the city

if you have their phone number, consider a reverse lookup to get their address

give your contact information

check your spelling--I don't know which of the three you used is correct

add a follow-up post if they're found[1]

did I mention the whole name and address thing?

I realize you'll be stressed and upset. I won't hold it against you if you fail to do this. But you're much more likely to get a helpful response if you do.
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[1] Promotes happy noises in people doing data entry. OTOH, the "I met a guy named Joseph on the ferry, I hope he's okay" is just... not... working.