Ehm. I think you'll find when you think about it for awhile that you did the right thing anyway. Why resist? You'll just endanger yourself, and for what? Material things, it's not worth it, friend.
I was once robbed, or rather, the car I drove was broken into while I made a delivery. I transported medicine to some psyciatric clinics, metadon for example, pretty sought after stuff. When I get back out I see two asses that have broken into my car and made it off with most of the drugs, they were just on their way back to get the last of it. When they see me, they turn and run. What do I do? I chase after them like a fool, so pissed you wouldn't believe. Pure testosterone. What could I have done if I've catched them? Fuck all is what. There were two of them, they could have kicked my ass without even trying. I also later found out that at least one of them had a gun, so I was real damn lucky they managed to jump into their car and get out of there just as I caught up with them. I feel so damned stupid now, but back then I didn't think, I just reacted. Anyway, got a good look on their plate and the cops got them a few minutes later. That's all you should do really. Hang back, let them take what they want, try to remember the important stuff and call the cops.
Seriously, it's never worth it. Your life is what's important, nothing else.