Try a bucket? He might come to a water source rather than food. The way I finally caught a escaped ASF was in a 1/3 full pitcher of water, but they're smaller. If you can put a 5g bucket where he can get to the top rim, he might fall in and not be able to get back out(if it's empty, he can jump out, but with the water, he has nothing to push off of to jump).

Good luck, and I second the "Don't feed it to anything or put it back with your feeder rats". Never can tell what he's eaten or touched. Even the residue from the sticky traps might be harmful.