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How long have you had him now? To begin with they sometimes pee all over the place & it's such a small amount it can be hard to find, I have found Russians take to using a litter tray very quickly if it has chinchilla sand (not dust) in it with or without putting soiled bedding on top so I would just try that & put the tray close to where he sleeps, they can often be a bit lazy & don't like to have to go far when they wake up for a pee!