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Hopefully you can just tilt the glovebox door down (after emptying it out, of course) to gain access. Those push-pin clips in the 5th Gen were a real pain to get back in once you re-installed the door. Will eventually find out...
There are two retainer clips for the glove box, look at the top left and right. Depress the clips and the glove box drops forward on the hinge. When it drops you will see the fan enclosure and a small horizontal rectangular panel. There are a couple of clips on it, remove them and you’ll see the filter.
When you put it all back together, be sure to line up the “shock” on the right side of the glove box. It slips in to a piece mounted to the dash