Hi,

The Inpanel box is a Japan only Lexus accessory that replace the ashtray with a nice leather lined storage box.
I did this mod on my GS and it was one of theses little details that you appreciate more and more over time. I ordered the Inpanel Box from Carslon, they do not list it for the IS-F, but obviously it fit just fine.
I installed quickly and didn't take time to take pictures, so if you are interested please check the old GS thread, it is basically the same except for the instructions to remove the center console

 

That's a very useful mod! But man that little box is expensive!