Is it the glove box, or the glove box door? Have someone listen to those specific parts. If it is, some felt piece you stick to the feet of furniture work well. If it is deeper, then from the air filter location (you'll have to pull the cowl completely up and off, so take all the torx screws out) you can see where the dash attaches to the firewall. From that side (under the hood) you can tighten these...but don't tighten too much....they can snap off as the anchors are plastic. Best way is to have someone push the dash towards the front of the car from the inside as you tighten things down from the outside. It is hard to explain, so you will have to just get in there and see what I'm talking about.
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1998 S70 T5 Emarald Green Metallic, 2004 V70 2.5T Ruby Red, Previous Owner of Black '94 850 Turbo Wagon. My cars have been running so well lately they've got me worried.