So I'm trying to install some new horns and need to get access to the bottom of the horn relay to be able to wire them in to the existing steering wheel horn button relay but can't seem to lift the fusebox even though I've unbolted the only two bolts I can see holding it in place as per arrows below

The mount, circled in blue, looks like it should be just a guide but it doesn't easily seem to move

Any tips, thoughts or past experience much appreciated!

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