I took my Russian tortoise Mr Gorbachev to the vet yesterday and they said he was healthy and he even peed on the doctor. I told them he hasn't pooped in a couple days which was odd but I figured if he peed it was fine. I caught Mr Gorbachev eating some tiny wood chips in his enclosure today. I began to worry that if he is eating wood it could be blocking his poop. I've been soaking him every other day and he usually poops when he soaks and he hasn't the last 2 times. I haven't found any poop in his enclosure. And I'm using a new subsrate (pictures attached) which the vet said was suitable. How long before I should worry?