Not yet! I set up a bucket trap a few days ago, but still nothing except last night making a lot of noise tearing up the cardboard lid. So I now have three traps going and it's two weeks today so I'm wondering if he'll now start to miss getting regular food and being with his brother in the cage...but it's really up to him!
I am concerned about what he's eating actually, and I read a thread on here a while back about a rat developing pica. Since he's under my counter he's found a way to get on top, so every night he's been searching for food up there and every morning I see the results...chewed through plastic bags of flour, a silicone tea bag holder, some soil from a succulent plant, and I even discovered that he somehow got into my kitchen drawers and nibbled the plastic lids of my spice jars...I'm hoping he didn't eat any chili flakes but I literally have no control over this behaviour except to remove everything from the drawers. The poops he's been leaving behind have also been increasingly strange, one was completely black like tar and today three clumpy pellets with what looks to be undigested non-food (stuff like that makes me squeamish though so I didn't look very closely). It wouldn't be a shock if he was getting sick.