Thrift store had the hookup today

Grabbed a couple $10 bulk bags(mostly friends sets, almost fully assembled) but behind the electronics counter they had this hidden side set up on a shelf. I had them bring it down for me, and was shocked to see the $30 price on it. I took a quick look inside and saw a box half full of unopened bags(including the instructions) and a small Ziploc(filled with mega-bloks) I got home and checked it all out and it is missing bag 8 and 9. They seem to be just part of the roof, and...