2007~2015 Amplifier location?

Where is the stereo amplifier located for a 2015 CX-9 Touring? Repair manual said it’s behind the passenger tail light, Mazda dealership says it’s under the passenger chair. It’s not in either spot. I also checked behind the driver side tail light and behind the glovebox. Any other suggestions? I really don’t want to tear the car apart in hopes of randomly finding it.
 
Everything I can find says it is in behind the right rear interior panel. If that is correct, the only way to access it is by removing the trunk box and the right interior panel.
 
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