What else should I be doing? Wife was making some angry comments to me this morning about not having caught it yet, and yelling to me obvious things to me about how this rat was going to chew a hole through the wall into the closet or potentially start a fire — even though I spend 45 or so minutes setting up some obstacle courses for this rat in the kitchen every night. Need some FBG to make me a hero.
As a restaurant pest control tech for 12 years, I've never met a rat infestation I couldn't take care of. Here's what I would do.
First, forget the traps and get some of
THIS (you might be able to find it in smaller quantities locally or online) These bait blocks work, trust me. Then get some grape jelly. Not strawberry, not raspberry, but grape.
Traps work well in some situations, and not so well in others. So let's kill the bastards and not worry about trapping them. Still set the traps if it keeps the wife calm, but if they're not working, time to try something else.
It sounds like you've been doing good as far as sealing any possible entry points. That's step one. If a rat/mouse can get their head through a hole, they can fit their body through it, so look for small holes too and seal any up. Also
check under your kitchen sink for pipe entry points and make sure they're sealed up.
Now take some bait blocks and smudge a little grape jelly on a few. Just a light coating on one side, like you would butter toast, and place one behind your fridge and wherever else you think they may be going or coming from. If you have any sort of an attic, put a few blocks up there as well, and space them out if possible. Attics are the #1 place rodents hang out. Anywhere else you think they've been or might be, place a block.
Then wait and give it 2-3 days. The only bad thing about bait blocks is sometimes you'll smell something dead, and then you'll have to find it.
If all possible entry points are sealed, this will rake care of the problem.