it has been a long time since I removed my seats, but as I recall you will have to pry those plastic covers off to reveal the bolts. Use a socket (I can not recall what size) to remove the bolts and lift the seat out. Are you certain you can not use gripers or if the items is magnetic use a magnet on a stick.
something like this. They even have them with lights built into them.
You can also use (if you have access to one) a video scope which will assist you in locating it.
M12 M-SPECTOR 360 3 Ft Kit | Milwaukee Tool
The MILWAUKEE® M12™ M-SPECTOR 360™ Rotating Inspection Scope has a rotating display, 640x480 sensor, 4 LEDs, 2.7” display, 9mm head.
www.milwaukeetool.com
Amazon has less expensive scopes.
