Found a Iphone 5 with no SIM card and broken?

It's just weird, so i found a Iphone 5 with broken back on the street. It was in the dust when i found it and it has 10% battery life and it in start mode, it's asking for country and Wi-Fi which is set up mode. It's a real Iphone 5 i can tell (Cause i own one) But i not sure if it's legit or not. Please help.

Added (1). It also had a screen protecter, the screen is all fine but the back Iphone 5 bottom glass is broken.

IPhone probably (99.9%) legit, but there's just 1 thing i do not understand why would somebody throw a perfectly good iPhone away.

You can tell that it's a real iPhone 5 but you're not sure if it's legit?

If you manage to activate it, and you've owned an iPhone before, you'll notice something different about it if it is a fake iPhone, I've seen a fake iPhone before. I think you should restore it to be safe, and then just use it and see if it's good. You just got a expensive phone. HEHE.