Well I finished my first monster box and I will NEVER do that again. Thing is too heavy to move easily and is too large to fit on the floor of my safe (partition in the middle requires it to go in sideways, which doesn't allow the door to close). So I have come up with a solution: https://monumentmetals.com/empty-perth-mint-2-oz-koala-box-no-tubes.html Kangaroo boxes hold half as much so they are easier to move and store.
One of the reasons I got out of silver, jstto hard and to heavy to store broke a heavy duty shelf in my safe with to much silver, converted everything to GOLD way more bang for the buck !
Koala/kangaroo...potato/potato I picked up some of the empty yellow Royal Canadian mint monster boxes. I still have a little room in them. One thing about silver ballast is if you didn't bolt your safe down it's harder to get out the door. Does sound like maybe an upgrade or additional safe is in you're future.
Damn a monster box, that's quite an accomplishment! Hopefully you got all the ASE's for good prices! I'm working on a tube, I have 15 so far so I'm almost there!