You're right - a week isn't long at all for a young snake whose whole world has just changed!
If you aren't doing this already, you might spend time just sitting near your Ziggy's enclosure and talking to him. They don't hear the same ranges as we do but they can definitely hear within the range of human voices. Sitting nearby and just reading or whatever will let him grow more accustomed to your presence in general without having to deal with activity in his enclosure or with handling.