I would go on the basis that the rattles could still be present. I'm still taking mine in AGAIN to try and get them sorted out. Even after going in for the belt recall, there is now another rattle on the passenger height adjustment. Very disappointed with Lexus Glasgow.
While mine was in, I had a courtesy car and that rattled from behind the aircon controls. That was an 06 plate, so should have been rattle free.
Be very careful, although the rattles on mine only started after a few months, so even on a test drive you may not hear anything.
Sorry for the doom and gloom, but getting totally fed up with these annoying niggles on an otherwise superb car.