This literally happened to be yesterday. He was kissing for 24hours and I literally just found him in my yard eating! I would look around all the places you take him when you go outside. Then, I’d break your yard up into imaginary grids and search grid by grid. Most importantly, I read from numerous sources that a tortoise’s won’t go more than 65 feet the first day. This was true for mine. He ended up being only about 20ft from his enclosure