Ok, so with regards to:

I recall doing a search on that address when 'rippleme' first posted it and didn't get any other hits at the time, but having revisited the issue recently I found that a few days later this was posted on the Antshares blog:
https://www.antshares.org/zh-CN/Blog/Details/36
Now, given that the dates they give for the duration of their ICO match up with the activity for the transactions leading into the multisig address and that, something I found odd at the time, Razormind's DEOS ICO actually ended a day later, we can conclude that this multisig address is not from the DEOS ICO/crowdsale.

http://www.razormind.co.uk/crowdsale/

So the question now is, where are the bitcoins from the DEOS ICO?