If he'd just robbed another car, whose alarm was "going on like crazy", do you really think he'd still be hanging around?

There are always guys in car parks trying to earn a few riyals by helping you load your car. I agree they're a bit creepy and are best avoided, but I don't think they're thieves.

Regarding the mention of "dark skinned", I think the poster was merely trying to provide a description so we can keep an eye out, rather than any thing racist. If you're describing a person for whatever reason it's quite normal to mention they're skin colour (though "dark skinned" isn't the most PC way of doing it, but hey, we're all anit-PC on here anyway!).