Paper sack?
Aint Life Garand,
Welcome to the forum. I like your moniker.
If I am investigating a sound that suggests I should be armed, a paper sack around both my gun and my and is a very fast expedient. Pick up the gun, put the gun and my hand in a paper sack, with the mouth of the sack secured between my thumb and the hammer.
In most jurisdictions, concealed or open carry is not an issue.
If you REALLY don't want to appear armed, substitute a bag of trash for the paper sack. Innocent-looking enough.
If I want to have both hands empty, my Ruger SP101 (snub-nosed 357 5-shot revolver) fits in a front pocket, so either unholstered or in a pocket holster, it works.
My Colt .45 Officer's model fits securely in a front pocket of most of my jeans, but the butt does stick out. Unsecured in a pocket in condition one (Cocked, Safety Locked "On" with a round in the chamber) is not something I would do normally, though.
I do have a few holsters that slip a piece of leather or plastic or wire between my body and my belt or waistband. I believe the generic term for this type is "Paddle Holster", for the paddle shaped piece that fits between your body and your belt/waistband to secure the holster. Notorious for not staying put (or being impossible to remove without disrobing yourself). But for temporary wear as your situation calls for, it should be adequate.
Safariland "Klipspringer" is one I have and one of the two I would wear out in the general public. The other is a Sherpa Blackhawk's paddle attachment. The Klipsrpinger goes on pretty quickly, but the holster is outside the waistband, so a jacket or untucked shirt would be necessary for concealment. If absolute concealment is not necessary it would work well. I checked the internet and found one on ebay for $58. I found one several years ago at a gun show for $10.
When investigating suspicious sounds on your own property, I would thing open carry in a holster (or even your hand) would be defensible. If at night, anyone you encounter should be lit by your flashlight such that they would not be able to see anything at all. It may be impolite to (temporarily) blind somebody, but there are exceptions for people you find on your property uninvited.
Good Luck.
Lost Sheep
Or, (because I cannot resist humor) Get a big, growly dog on a short leash. No one will notice the gun in your hand.