Never paid any attention to it myself since you have to have a reason.
Apparently 385,000 asked for them and over 240,000 have returned them!
http://results.elections.virginia.gov/vaelections/2016%20November%20General/Site/Statistics/Absentee.html
That’s ALL absentee ballots.
I think the “returned in person” ones, 140,000, are the ones at issue.