As the OP reported in the link I posted above, they had all caps in place. Cap found was an 'extra' from the assembly line, heh.From the left back seat area look at the extreme rearward end of the plastic trim over the inboard front seat rail. The cover is on top of the trim over the rail.
I don't have piece 15 on my center console. I have a 2014 TH with cloth seats so maybe different trim levels are different.
edit to correct quote from @sanghill as per his latest pot.