I have it on very good authority that CCI Rat Shot from a pump rifle, is extremely effective. Not too loud, and very deadly on them to about 20ft. We had a whole fam damily of 5 of them in our attic, and most were found flopping directly after hearing a slight pop sound. The only issue you have when finding them like this, is you also need one of the extendable paint roller handles to duct tape a hook on for retrieval.
For traps, it seems that they cannot keep their mitts off those suet blocks my mom hangs out for the birds. She had 4 of them fighting for one block hanging from a limb last weekend. Those green blocks they sell at the feed store for rats work as well, but they will find the worst place in your attic to bury up in the insulation and croak.
Just wait until one finds a gap in the header of the wall and gets down between the studs and builds a nest. Best thing when this happens, "I hear", if you have a 38, 357 , or 44 spcl or mag, are these,
Of course you have to then cut a small area out to retrieve the culprit I hear, but they do get the job done quite effectively even through 5/8" sheet rock. Just keep the distance from muzzle to wall within a foot or so and your good to go, and
SAFETY FIRST don't forget to wear your safety glasses, or so I was told. Oh and a primer by it's self lighting one of these off, is
WAY louder inside than you would think, so use accordingly.
Like I said, a whole fam damily,