I noticed this issue a few days ago, but I wanted to play to make sure I actually am certain that things went missing. I'm about 95% sure there were items in all my chests that went missing. I remember I traded a UR race for a lot of defensive items, and one of them was an armor that would give immunity to implode, and it would work in the dessert run to prevent getting imploded. I was not able to find it on any of my characters.
I also had gold long before the wallet existed, and the Bank would hold it, but it is not an issue if that information cannot be found.
I have no way of proving anything I said, and I am asking about items that were there years ago, but I know it is better to ask than not ask at all.
Let me know if anything can be done, but if not, I'll just move on. I'm enjoying the game again either way. (Username is Lynslayer)