I have a five year old sulcata about the same size. He's not a fan of digging yet but he will. If I sit next to the tort table it will come over to see if I have a treat. Having a treat has helped overcome the shyness. When I doing anything with his tort table he has to see. Very nosy. Just keep sitting with them and find a nutritious treat. Mine loves cactus and cactus pear.

Julia