Yes, I have a written record of our agreement, and receipts for my monthly payments of £120 (for 3 containers - one now missing) going back 3 years.
It is impossible to tell how much I have lost in monetary terms since there are three containers and only one is missing. I do not know what was in the missing container.
The company has told me to send them an inventory so that they can check what I have left and what's missing.
However, it is the irreplaceable things I am most concerned about. About 5000 photos and negatives, diaries and letters dating back 45 years, heirlooms from my deceased mother, etc.
Should I get the police involved (possibility that the container has been sold)? Can I sue?