It is a bit of a misconception that safes are, erm, safe. If someone really wants to get inside it they will. However your common or garden burglar wants to be in and out asap. Even if they do find a safe they are not going to hang around to open it for more that a minute or two. They want small items that they can put in their pockets or small bag, the biggest thing taken, for the most part will be an IPad or laptop.
As mentioned above a safety deposit box is a very good way to go for you gold and high value silver. If it normal bullion silver, a normal not too cheap safe is fine. Plus make sure your insurance company will cover items in the first place! Not all of them will. Consider asking family to hold stuff for you too.
Going back to boxes thing about how fast you may need your stuff, if you need something quick it's no good having to wait until the bank opens on a Monday at 10.00. Not an add, but my main bank is Metro open 7 days a week 363 days a year. I have had no problems with them myself, or course you can use something like this.😁