"Bolted to the floor"
Yep, the knob and clip is the same hold-down hardware as used to secure the tool bag on a jump-seat version; the knob mount is one of the threaded holes in the body installed for the bottom seat support cross bar. NOT A VERY CLEAN INSTALLATION! Interestingly, the Velcro straps used in your rig's tool retention set-up were provided as well.
I have no idea if the dealer installed, or tool bag was in place from factory. All hardware used is definite OEM. I'm planning to build some sort of flat floor arrangement, so have left tools as is for now, otherwise they will be relocated to the clips as your picture shows. Thanks for sharing.