Select the right pages to scrap

The code before overwrote some data the outside code expected to not be
modified which resulted in the scrapped pages to be offset.

Test: - cts-tradefed run cts-dev -m Print
      - Tried to repro case in the bug
Bug: 62296301

Change-Id: If3f250dbca43125bbbe9faadc5183a6dbaa69481