Glove box light is listed as included in Z87 Custom Interior. There is also a ZJ9 Aux Lighting available that likely added the rest of the lights.
I came across a glove box light and harness from one of my 70's Nova's and looks like what you have by the fuse block connections: If all else fails, open the glove box and turn things on, disconnect the plug from the fuse block and see what goes dead. Jim
This is from the GM Canada Dealers order guide for the Camaro. See ZJ9. https://my1970z28.com/COPO/options.htm