funky fuse box in my 75 sport fury

[d9103365]

I recently got a 75 sport fury and noticed that the fuse box is hanging down in an unusual way. I can't figure out how its supposed to go. In my other b bodies it attaches to the firewall...but here it seems to have with a special "tab" of some kind...pic is attached. any advice? I'm afraid someone is going to kick it eventually and then I'lll be screwed.

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[d9103365]

ok so I saw in a magazine article that the fuse box in Furys were designed to flip up into the dash and flip out for easy access. Makes sense...but I can't figure out how this is supposed to go in. I'm afraid I will break it...maybe its broken already...but I can't move the tab. Does anyone have a pic of how this is supposed to go?