All this is exterior to the unit, behind it. The styrofoam block looks like a piece of shipping material to prevent damage to the metal tube. Presumably it should be removed but checking the installation instructions for confirmation is reasonable in case it should remain in place for some reason. Seems unlikely it'll cause a problem remaining there.

The folded paper is attached to the power cord, may be an instruction sheet. Likewise the paper perhaps should be remain attached to the power cord for future service of a service tech ... best way to know is pull the range out and check what it says.

You didn't cite the brand/model of the range for anyone to look up the installation instructions so you'll have to do that yourself.

I'd be more concerned about the gas line possibly having too much of a kink.