What has just happened?

You decide to take the hour long trail.
It has no problems and you get to the forest easily.
You and your friends come across an abandoned car, and you see a backpack, keys, and a wallet.
You open the wallet and there is no I.D. and the backpack and trunk have nothing in them.
You guys just keep walking, but you hear people behind you running.
Do you run or wait there?