Story highlights Surveillance video footage shows that Cummins has darkened his hair

Officials believe Cummins is armed with two handguns

(CNN) The Tennessee teacher and 15-year-old girl who are the subject of a manhunt were spotted at a Walmart in Oklahoma City earlier this month, the first confirmed sighting of the two since officials say the teacher kidnapped the girl.

Tad Cummins, 50, is suspected of abducting Elizabeth Thomas, his former student in Maury County, according to the Tennessee Bureau of Investigation (TBI).

"My precious little girl is out there, and we have to bring her home," said Anthony Thomas, the teen's father, in a statement.

Elizabeth has been missing since March 13, not long after a student reported she saw the pair kissing, police say.

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