I was in the process of building my store and the stuff in my chest disappeared! I had it locked, not to mention I was working on my new store and it was entirely closed off to the public so there was no entry. I had stacks of iron ignots and stacks of redstone. I would like to retrieve these items. Please help.

 

My chest was in Station 24. I was working on my store. Everything was blocked off, I didn't see anyone come in but maybe I missed it.