Separating the fuse box to replace 140A fuse

Hello, I've been trying to find information about how to get to the bolts that secure the 140A main fuse. Almost all the information I have found is for a different sort of fuse box. My truck is a 2003 Tundra 4.7 V8 with the tow package. I think the tow package is the reason my fuse box is so different from the other 2003 Tundras. My Tundra's fuse box is all one piece with an L-shape. I have already separated the two halves of the box, except for the clip inside the mounting bracket. I can't seem to get that one. But I don't think I really need to because the box is open enough already.

I think based on some videos of other Toyotas that the sections of the actual fuse receptors have to pull out from the bottom of the bottom half of the fuse box. Now I'm not sure what to do. There are some slots with visible metal bars that look like maybe they have something to do with breaking down the fuse sections. Some videos say to jam screwdrivers into some of the slots, but I'm not sure how to do that and if there are any more clips holding it together.

Any guidance at this point would be very appreciated.

 

This help?
https://www.youtube.com/watch?v=iNsNZBt3rCU

 

Yeah, that was one of the more helpful videos I found even though my fuse box is different. This video showed me that the fuse holder slides out from the bottom. My question now is how to get it to slide down? Seems like some people say that there are clips that allow the sections to be broken down into individual pieces. I'm not sure where these clips are or how to press on them if I find them. Or is it just held by friction and I have to bang on it with a hammer to get it to slide down?