Help - can not retrieve item from drop box. (DB)

[Radlumril]

As a relatively new player I am getting ready to fight Maat to exceed level 70 for the first time. I purchased a Vile Elixer +1 at Auction House for good price. So when it didn't let me buy a second one I sent first to a mule charachter of mine with the Digaga NPC in Jeuno Port and proceeded to buy another Vile Elixer +1.

I then tried to unload the first Vile Elixer +1 from Digaga - to which is responded: "You can only hold one item of that type" - but the delivery was cancelled.

So I sent the 2nd Vile Elixer +1 to another mule and that mule is now sending it on to another player entirely.
The 2nd item "Vile Elixer +1 is out of my main charachters posession yet I still can't retrieve the first item from the Delivery Box. I still get "You can only hold one item of that type" as a message. Nor can I unoad it with my mule as it was cancelled.

I do understand now that player can only hold one High Quality item at a time. So I doubt I will repeat this "mistake". But the game should not get stuck either.

Tried /helpdesk but that by automation only suggested I request help from players in game (which I did with my linkshell) or search forums. A search on forums which lacked quote - unquote specificity as per a normal web search engine.

Issue was resolved: I had mistakenly moved a plain Vile Elixer (forgotten I had it) to my mule and not the Vile Elixer +1 as I thought. Once the VIle Elixer +1 was removed I could get the item.