The defective item came from one of these and each box contains only two items.
There are 6 defectives in the 3 boxes containing 2 defectives each.
there are 5 defectives in the 5 boxes containing 1 defective each.
Hence there is a 6 out of 11 chance of having picked a defective item from a box with 2 defectives.
The next one chosen from that box will be also be defective.
Therefore, there is a 6 in 11 chance the item was chosen from one of the boxes with 2 defective items.