Maybe or maybe not OT. I remember a murder case, but not specifically as to the who was killed or who did it... Anyway, a few cartridges were found at the murder scene and, of course, the bullet fragments as well but a gun was never found. Without the gun for comparison, the case went cold. Years later a new LE guy got an idea. He went to the property where his suspect used to live and, using a metal detector, was able to find old cartridges buried in the soil where the suspect used to practice shooting his guns. One cartridge out of many matched the cartridges from the murder scene and, with that, he was able to get a murder conviction. Just to show that you don't always have to have the guns used in murders.... you only need to know where someone practiced shooting a gun before using the same gun in a murder. Which is why, I suppose, murderers... who plan ahead... usually use a "new" gun and then dispose of it. However, if the murderer(s) in this case are local and follow habit, other locals might be able to guess where that disposal took place. People are all creatures of habit, after all. They go where they've been before and where they feel comfortable. Just having some random thoughts...