I think the story is fiction. I don't think commodities are sent wherever your office is. Isn't the location of delivery set as a part of the futures contract?
I'd guess, for this particular story, that at least the misparsing of XML for a futures contract actually happened, and maybe that some producer consequently had to ask about the feasibility of delivering to a corporate office that happened to be in former docklands. It's entirely possible that the commodity involved was not coal, and it's extremely unlikely that a guy showed up one day at the front desk with a clipboard and barges outside.
In response to skepticism in the comments, the article's author gives an example of a futures contract on eggs where delivery was accidentally taken: https://web.archive.org/web/20090925022603/http://www.minyan...
QL coal doesn't trade anymore (all the active coal futures I can find now are cash-settled) but delivery seems to have historically been at the discretion of the parties, so the story is at least plausible.
In related news, there is a Planet Money Podcast (episode called the Eddie Murphy Rule) where they interview the trader who took possession of a bunch of cattle by mistake IIRC.