that is exactly what I bought & I paid 15k minus my trade in.
I have had lots off issues with rattling dash, rattling parcel shelf as well as smelly ac, been back to lexus countless times and all the problems still excist!
They have now said because the car is more than 3 years old the manufacturers warrenty has expired and the used car warrenty does not cover these items.
The most recent visit regarding the dash rattle ended with "we know the dashbord rattles but you will have to pay £90 to get a third partly to remove the windshield to fix it"
I am now going to have a go myself, have taken the sat nav out but can't get far enough back so have accesed it through the centre speaker, i am pretty sure its the vent mounting onto the dash that is causing the noise - i will experiment with my hand in the hole whilst someone else is driving.
I have managed to turn off that damn annoying seat belt noise though, I do wear my belt on the roads but i do have to move my car regually at work and it was driving me nuts with it going off when i was only driving 100'!
Ben