Wow, that sucks. Have him contact istock. They will act very promptly to protect their exclusives and I'd bet both sites have removed the files by end of day.

Send an email to Jeff at ce@istockphoto.com or contact Lobo directly (you didn't hear that from me). Do NOT go the way of the regular support ticket since that does not go to the correct department to be seen in a super timely manner, as is necessary in cases like this.

You may also want to remove your post here as to keep from alerting the thief.

You know, I looked at those icons he was selling and thought they looked a lot like sodafish's. But different enough that it could just be a coincidence. But those backgrounds are a straight rip-offs.