There may not be a great deal of direct "proof" in the way of experiential documentation from that era but, for myself, there is an enormous quantity of other proof. The more I learn and discover about our incredible Planet and the complexity of all of its systems; the astounding beauty and complexity of life itself, there is no doubt. Then when looking into the sky and pondeiring what we've learned about this awesome superuniverse, what more can one say?
The design of this material dimension is stupendous. Who knows how much more there is to delight our curiosity?