Scanlan said those 5,650 voters received a letter from the Secretary of State with a postage-paid postcard, asking them to affirm they did vote.
"That is still a work in progress," Scanlan said last week.
Voters have until April 7 to return their postcard. So far, 3,647 of them have done so.
"We're still almost 2,000 short of what we need," Scanlan said.
Some letters came back without a response.
"We have had 337 mailings that came back undeliverable as addressed," Scanlan said.
When voters don't respond, the Secretary of State provides information about them to the Attorney General's Office for followup.
"They should expect to hear from the attorney general if they don't," Scanlan said.
There's no penalty under the voter ID law for people who refuse to respond.
But voter fraud is another matter. Should the attorney general determine someone voted illegally, that could lead to prosecution and, ultimately, under state law fines or jail time for offenders.
Scanlan said the attorney general's review could take several months.
"This process will take some time," Scanlan said. "In the end, we may get some very interesting responses."
Bills to watch: House Bill 287, House version of voter ID repeal. In House Election Law Committee. Hearing held Feb. 5. Senate Bill 183, Senate version of voter ID repeal. Hearing set Wednesday before Senate Public and Municipal Affairs Committee, 9:15 a.m. in room 102 of the Legislative Office Building. HB 595, House bill repealing Phase II of the voter ID law. In House Election Law Committee. Hearing held last week. SB 182, Senate bill delaying for one year Phase II of the voter ID law. Hearing set Wednesday before Senate Public and Municipal Affairs Committee, 9 a.m. in room 102 of the Legislative Office Building.