The biggest thing you can do to make your property a target for theft is advertise you're into guns.
Criminals love stealing guns. Especially since some people keep thousands of dollars worth of guns sprinkled around their house, and gun owners like this are unlikely to write down/register serial numbers.
It's also insanely easy to fence them. There is a robust used market and resources to advertise anonymously and they hold value well.
The only thing stupider would be something like:
The only reason I don't own more guns is my wife loves diamonds. I also inherited a large amount of bearer's bonds and don't believe in safety deposit boxes.