Nobody knows what will happen to any car tomorrow. This may be ignorance speaking, but what papers am I supposed to show? A previous owner did the swap himself. He also owned the other iS300. The other iS300 went built 2jz turbo. So the guy just writes down on paper, "I swapped the motor." If that's what you guys really want for proof...
If anybody is interested, why don't we check the car out and look at how healthy it is first, before we throw out a lowball.
I've been offered a few nice cars and am leaning toward a trade anyways so I don't get hit with taxes.

Thanks for the interest everybody.