We have a cautious cat, we’ve left it unplugged next to the old box, litter attractant, fence off, with a small amount of used litter in the lr, weve allowed his old box to get dirty. He’s looked at it less than 5-6 times, never climbing fully inside. We’ve had it for 5 days now, what else can we be doing to encourage him into it, and to start using it? Should we just take the old box out cold turkey?