There is no underhood light, unless it is a Euro thing. The plunger style switch you are talking about near the battery is for the anti-theft alarm system. It may be unplugged because it was diagnosed as intermittently making the alarm activate, the neighbors love that sort of crap at 2am.
There is a trunk light. if you look at where the switch is on the deck lid, you will find the light inside the framing in the trunklid just above the switch. Maybe the bulb is missing, I believe it is a 10 watt bulb.