A safety deposit box at a solid bank could be an option if you can insure the content. I don't know a single bank that insures the content of︀ safety deposit boxes in case something happens, when you sign that contract they clearly tell︁ you that.
Make sure the bank you choose has no plans of merging with another︂ bank, although you rarely know about that beforehand.
I had a box in a bank︃ with jewelry, money, and documents, I didn't visit the bank for a few months, I︄ was away traveling, when I finally went to the bank it had closed, and all︅ the boxes had been moved to another branch near by, yes I almost had a︆ heart attack.
Imagine going to another bank where you've never been before and someone says︇ to you "the boxes are in the process of being moved to this branch, but︈ they haven't arrived yet, we will let you know when your box arrives at this︉ branch."
A few months went by, finally the day came, I crossed my fingers as︊ I opened the box in one of those little rooms that banks have for customers︋ to check their boxes. Luckily everything was still there, but it's not something I want︌ to go through ever again.
I'm now going through a worse situation as the bank︍ that I was banking with, a full reserve bank, was closed by the Regulator. It's︎ been 13 months since customers lost access to their money, no idea when or how️ much of our money we will get back.
So moral of the story, there are always unforseeable event that can happen at any time when you least expect it.
I am going to sell the Gold that I have stored in a vault facility, I will buy Gold and I will make a hole under my bed, if there's a fire the Gold will be fine, if a thief gets into my home, no way he will find it, if I die my wife and children will know where the Gold is.
Once you go through what I've gone through you become paranoid. I want to sleep at night knowing that my stuff is in my control, I do not︀ want any more nasty surprises if I can avoid it, it's not worth it, trust︁ me.
You can use Qenta even if you're not a US resident, but I've︆ never used them, so I don't know how reliable they are.