Hardwire kit earth screw - WHERE?

Hi,as in header. I just received my hardwire kit for the spotlight cam and the instructions refer to earth wire from house to section in the mounting box indicated Earth and a screw but I don't see an individual screw!I have a pk with 6 washers. A place with mounting screws,cover screws and anchors. A pk with 2 security screws. Wire terminal connectors, rubber grommets. Pk with bit and screwdriver. So where's the earth screw?help ?