Now that is funny. corporate creates a list form the HR data bases for each operation and sends those lists down. The folks at corporate are so far removed, they have no shot at being able to cherry pick the happy employees even if they wanted to.
What is ironic is your last line. This leads me to believe you would be very reluctant to take the survey if asked. I have seen in the past that if someone on the list that was sent down to an operation is either not available (on FMLA or military leave etc) or just flat out refuses to take the survey, the operation may be asked to pick someone to take it to get the requested number of respondents. I wonder if everyone other than the 5 drivers you mention have put themselves on a "will refuse to take if asked list"...