Where's my subwoofer and amplifier!

Hi everybody, I just bought a 2005 GMC Yukon Denali w/ BOSE Sound system and sounds amazing for a stock stereo! But can seem to locate the amplifier and subwoofer?

There's a spot in the rear behind the 3rd row seats on the left looking forward from the rear but when I take off the panel there's no subwoofer! Only a jack and OBD2 meter??

Pic posted⬇️