He's a Russian right? Is it getting cold where you are? The hibernate (brumate) for winter. If it's getting cold there, he cold be burrowed in for winter. So, if you don't find him now, don't forget to recheck in the spring. For now, check out under every plant, rock, stump, etc. check in the morning when the sun comes out and warms things up. Get down on hands and knees and feel for any loose dirt.
Hope you find him real soon. But don't forget to check in the spring if you don't.
When it warms up, dash out mid morning and start listening for movement and look for a walking rock. Bingo! I hope you find him. Chances are he is right there somewhere, burrowed under a plant or the shed or some rocks. Keep the faith. Mr. Binks come out, come out where ever you are. Now Mr. Binks. We are not kidding. We love you Mr. Binks. That should work.