I deposited to where you told me to.
I did a test. It was the back scratcher. I was going to put more items at first, but went ahead to test.

Now, it shows nothing in inventory. I waited 15 minutes and it still shows nothing in there. Checked the history and all, it shows I put stuff in.

I went into the Help area, read it. It doesn't say anything useful except that lost or unclaimed items are here at this one link..
I click it and it's the bot that I used to deposit stuff in.
It had nothing but 2 keys at first. Now it has 3 refined metal and my back scratcher.

I don't get how this work, it appears to be confusing. Especially when I followed the instructions on how to deposit..

Well, I deposited and after a few hours waiting, it never showed up.

Then I made this post, it shows up instantly...
So I guess it'll take a few hours to deposit an item..