If you've seen this type of cache before, it shouldn't be too tough, but if you're still new to the game you may need to think creative!
This little cache is just big enough for the log, which the lid of the container should help you retrieve. This area may be populated by muggles at certain times so please use stealth if people are around, and please be sure to replace the cache exactly as hidden to maintain fun and difficulty rating for future cachers. If you don't come up with it right away, don't get discouraged - get creative!
Ybat, fxvaal svatref jvyy or qenja gb guvf pnpur...