Having a safe signals that you have massively valuable stuff in the house.
Funny, I would think that it signals that you have your massively valuable stuff in the SAFE!
Get a good safe, bolt it down so that it can't be moved, and call it a day.
If you have to store them outside, most economical way that I've seen it done is in big PVC pipe with lots of dessicant inside and the end caps glued on well. Kind of a pain to get to when you want to go shooting, though.
This guy buried his for 15 years then dug it up: