NORFOLK, Va. — The settlement checks have been arriving without fanfare in the mailboxes of 262 Virginia families whose homes were built with toxic Chinese-made drywall. It’s the first money that many of the families in a class-action lawsuit have received since discovering about five years ago that their walls were sickening them and destroying their homes. But there were no celebratory undertones in recent conversations with several of the families. There were a few expressions of gratitude &mdash …