Within a few days, there was these posts (looking for a short ICQ).
https://gfy.com/showthread.php?t=1087790 Spankitmedia
http://m.gfy.com/sell-and-buy-forum/1080505-buying-short-icq.html Spankitmedia
http://m.gfy.com/fucking-around-and-business-discussion/1087078-whos-selling-short-icq.html freecartoon porn.
In that last linked thread, an ebay listing was posted that has Chillvaults ICQ for sale (which is obviously where he bought it). I would imagine the other new 6 digit ICQ's are also in that list.
Seems pretty A-B-C to me.