Nothing's missing.
Enjoy the ride.
I don't know why that's there to be honest with you, but there is no missing cover or anything; not even a screw or bolt that goes there.
this is a 2006 V8
I bought this used tho, today I checked the area near the brake pedal, found out there isnt a cover or something to protect those cables, etc.
check the pic
is there a cover missing on my 4runner?