MZ/MuZ Riders

Hi, I have been working on my mz I bought last year, im learing as I go as there isnt much info in the manuals.
How do you open the airbox? I have removed the seat, and removed the battery box cover. I have seen 1 screw looking from the battery side at the top left I slackend off, but its still up tight, I cant see anymore. Any help on where the others are? Thanks

the air filter is behind the battery location
after the battery is removed

Ok thanks. The air box it`s self is it just an empty void? Thanks

the air filter is inside it.