Disclaimer: This post advises you to commit crimes. Do not take this post as fact.
Disclaimer pt.2: You may get away with it "in Texas, at night, and on your own property," but you have to hit all 3/3 of those, if you have 0/3, 1/3, or 2/3, you are also going to be prosecuted.
Can confirm. Left my 1986 SAAB 900 SPG unlocked for a decade in a couple major cities downtown areas. The only thing anyone ever took was some of my quarters. They also never broke the window to get in, and then realize it was a manual. Didn't even take the radio, as I did take the faceplate inside with me