My truck came with the underseat storage (no JBL sounds). I asked the dealer about this when I ordered the truck because its $40 from the factory and ~$120 as a "port" installed option. He told me this is because of the labor involved in removing the rear seats to install the sotrage bins (yes, there are two, one under the 60 and another under the 40 of the seat split). I tried to weasel one of them out and couldn't do it, so I'm assuming that the only way to get it out (or in) is to remove the rear seat.
They are just plastic coated styrofoam. I was kinda disappointed, but also glad I didn't spend 120 on them. I can live with $40. I'll take some pics tomorrow. I haven't posted a single pic of my truck and I've had it a whole three days already!