There is a roll-back in the Realm when it closes. This keeps game data from becoming corrupted(THERE IS NO WAY FOR KABAM TO FIX THIS). It is an inherent programming flaw. I can not determine when exactly the roll-back occurs.
So, grab up an event notifier. You will need a decent understanding of how to modify your own client. Multi-boxing will make spamming your clients' chat/keys easier. I have set low resolution and modified game parameters to allow for clipping through objects.
Load two clients[optional 3].
Get into a populated realm, the more players the better.
NOTE: use no clipping parameters to make a direct line to the realm you are entering
[optional]Get your mule {client C} into a realm that is closing.(I imagine this can be any time)
[optional]Get your main {client A} into his vault, and pick up your items.
Head to the nexus.
Sneak your main {client B} through, into the realm that will be closing (before client A can load nexus).
[optional]Get your mule {client C} into the realm, with your main {client B}. and set the trade, accepting with your mule {client C}, but not your main {client B}
NOTE: Do not let the trade timeout
[optional]Trade your items.(accept the trade as the game initiates the roll-back)
Spam chat as much as you can.(I use a packet scheduler)
Sticky key your SPACE key with Both Clients{A and B}
Use your modified client to auto-connect-to-vault continuously during the lag, on both client{A and B}
You should d/c.
[optional] Let your mule {client C} enter Oryx's chamber.
NOTE: The longer you take to do all of this, the more time you give the server to save your character's state.
NOTE: The optional steps are a theory, I had to put in a lot of work to modify what I was already doing.
All of this is easily accomplished by creating two complex batch files and one simple executable.
I will probably test this in uswest, or in useast2(it is known for being a glitchy gateway)
There was a dupe that involves a blue bag, day one shit. My guess is Wildshadow used it in production and never bothered to fix it. A fair amount of players knew about it.