If I remember correctly some of the V8 versions may have had a front bumper like that.
I bought my V6 brand new and it came in on Gulfstate Toyota. But I remember that this year had a new body style and the lady mentioned that Dupont got involved with the fenders, etc to color match. I bought mine later 2006 like around December.
I think it is possible that you may in fact have a 2006 but with the 2005 bumpers. However, that would be odd. In fact, if you see a 2005 or 2006 you can tell because of the front and rear bumpers mainly.