I've gotten everything (dash, etc...) pulled out and am looking the the HVAC box. I can find only ONE bolt on the inside. I'm in the process of removing the right front inner fender (in between rain showers) as someone else suggested in another post.

Any suggestions where to look for additional bolts or other fasteners?

 

There is only one inside the case, which you can see after you get the blower resistor out. There are two under the case that you can get to after removing the fender liner. There is one under the case INSIDE the vehicle and I think two outside at the firewall, close to the distributor.