Doesn't make sense...

70,000 miles in two years? It's possible, but the car would show huge amounts of wear. I've never seen the car in person but in pics it looked pretty clean...

I've never worked at a car dealer and I'm not sure of the GA laws but with each of my 12 or 13 cars I've traded in over the years I've had to sign a mileage statement that says "TO THE BEST OF MY KNOWLEDGE THIS MILEAGE IS CORRECT AND ACCURATE" meaning that provided I have no knowledge that the mileage is inaccurate, I am not responsible if it is not correct.

I once had a 84' Bronco II, with a crazy lift and completly rebuilt. It had an additional 100K miles on the truck that I didn't know about. You couldn't tell because the truck was completely rebuilt. The dealer that took the truck on trade tried to squash the deal after they found out and I held them to the Mileage Statement release...

I wouldn't call Toyota. Let them deal with it. I'm sure if it's a problem you will hear from them very soon.