Anybody help!

I'm trying to replace my heater core. I've removed the glove box. Removed all the lower and right side screws and the hose fittings and cover box are loose. I can't locate any other screws or fasteners holding the cover box on, but something still holds it. Are there any fasteners on the top of the cover box. Do I need to remove the dashboard to get to them?

Any help is appreciated!

JC