Is there any left in New Orleans? After Katrina it seems they got relocated to my neck of the woods. The homicide rate went thru the roof that year also. The police had to set up mobile command centers where they housed them. My house had one of those apartments near it. Me and a couple of other families moved after things started "walking away" from our houses.Bummer!
If he hasn't done so already, have him provide serial numbers (do jetskis have HINs?) to every repair shop, used boat dealer, police dept., etc. that he can get to. He might want to post photos in as wide an area around the point of theft, as he has the time and money for.
Man, I HATE thieves!