word choice - "have been to" versus "went to"

I have read this sentence in an English course textbook:

I have just been to the bank.

What we know about the person who says that sentence is:

• He went to the bank in the morning.


• He was there, doing some paperwork.


• In the present time, he is at home.

I don't really know if been to is equivalent to:

1. I have just been in the bank.


2. I have just gone to the bank.


3. I just went to the bank.