Can't find the interior ventilation air filter in Galant 03

Hello,

Can anybody please help me: I just can't find the interior air filter in Galant 03. The manual for galant 96-03 says with illustrations that it is behind the glove box. I took off the glove box and while I was supposed to be able to pull out the air filter after unscrewing 2 bolts, I see there nothing that can be pulled off. I see the ventilation pipes as well as the rectangular shaped thing there that was supposed to be a filter. But it just can't be taken off, because they are all one part.

Thanks a lot for all input in advance.