What other options do you know of, to exterminate Rats that are inside of the living area of the house. All entry points from which the Rats entered the structure, from the out side have been secured. I have already caught 1 rat inside of the house one under the house using snap traps equipped with the yellow plastic bait holder, another rat was caught on a glue board inside of the house, but managed to get away. I'm using peanut butter and bacon for bait.
If you review our RAT CONTROL article, you'll see we list several other trapping options. Other points of interest in our article actually address the results you've had. In fact what you've experienced is pretty much what our article says one should expect when using either SNAP TRAPS or GLUE TRAPS.
With Snap Traps, if you don't set 12-24 traps, there is a good chance the local population will learn to avoid them after seeing other rats get killed. Same with Glue Traps. Since rats are strong and can escape their grip, rats will learn quickly to avoid the smell of glue once they see 1 of their kin caught.
At this point I suggest you get 2-3 LIVE TRAPS. As our article goes on to explain, rats won't get afraid of these since they don't kill anything. And if you place a lot of bird seed or pet food inside the trap so that rats which enter will think they've found a "pot of gold", other rats will anxiously try to enter. With the single catch traps this won't be an option but that's okay. As soon as you remove the trapped rat and make a reset, any still in your home will eagerly enter the empty trap because they won't learn to fear the device because it's not hurting or killing them.
Of course, if you suspect you have a lot of rats still inside, get one of the REPEATER TRAPS since they can capture many at one time. As for bait; be sure to use what they've been feeding on as lure. I know it's not been peanut butter and bacon; I'm betting it's either pet food or bird seed. And if that's true, use one of these as this is more of what they expect and love. Peanut butter and bacon isn't on the normal menu for rats and when making trap sets, it's best to offer what they can find close by or have been feeding on. When you introduce something "new", it alarms them and many times they'll avoid this odd food.
Lastly, the fact that you have already sealed up holes presents a whole new set of problems. First, as our article explains, you should always leave these in tact until you solve the problem and THEN seal them up. This is because rats like to go in and out of any structure. And when you know their entry points, you know where to trap. Now as soon as you seal those, you force the local population to find an alternate route. In this process they'll no doubt find another pathway and this will be unbeknownst to you so that even after you get rid of the current problem, there will now be entry ways into your home you don't know about. This is bad.
Hopefully there is only 1-2 rats left for you to trap and if that's true, the amount of alternate pathways they make will be minimal. But as our article explains, rats use scent for their trails and once the population is removed, you need to clean up the inside and outside areas with some NNZ. By removing their odor and scent, you'll greatly reduce the likelihood of new rats finding your home and coming inside. Scent can last 1-2 years with no problem and this is the main reason homes get infested over and over again with rats and mice. You must remove the smell that's no doubt on your house if you don't want future problems. Hope this helps!
Rat Article: http://www.roof-rat-control.com/rat-control
Repeating Live Trap: http://www.bugspraycart.com/traps/cage/repeater3-5-x-3-5-x-24