I was lucky enough to find an open box sitting on a palette this morning at Target while 6 or 7 employees were rearranging the entire toy section - almost all the lego had been moved off shelves and they were still stocking the other themes. Luckily, whoever had taken some packs from the box started from the bottom right corner, so I went and took the first 6 packs from the back left row, and a few random ones from the middle.
Came away with a Harry, Hermione, Moody, Tina, Newt, Cedric, Neville, and Graves. So the back left row seems to be the place to find him. Out of curiosity, when you say there's a pattern, where is the starting figure in y'all's lists? Front of the box, and then as listed moving towards the back? Or back of box to front?