[cypher]

I can understand you not wanting to stress him especially while he is still settling in but if he is peeing in there & storing food it will need to be cleaned out fairly soon & then quite frequently so if you can I would try to encourage him to sleep & nest somewhere more accessable.
What kind of house does he have? If you can get a house with a top that lifts off that makes spot cleaning or just checking on them much easier, a house should be on top of the substrate but with no base.
I would be inclined to remove the log & put some of the substrate/nest with his scent on it into a house that is easier to keep clean with regular spot cleaning.
Much as I love to see hams having loads of deep substrate to burrow in sometimes it helps to have a little less while they settle so they can't just hide away all the time giving you no opportunity to interact with them.