Does anyone know the origins of these elephants? I'm assuming they're not captive born but how did they get into the hands of this Texan?
The Texan, Wilbur Davenport, I presume either owns a circus or associates with a circus. The elephants came from another circus (Clyde Beatty-Cole Brothers Circus). All were born in the wild. Here is some more information I found at the elephant database.
Jewel, an Asian elephant (Elephas maximus) at San Diego Zoo
From 2000 to 2003, Tina and Jewel were presented on the Cole Brothers Circus by Adam Hill. In 2004 and 2005 the Cole Brothers leased the girls to Adam and had no elephants of their own. During this time the two act was presented on the Walker Brothers Circus, the Cindy Migley Circus and different fairs.
Will Davenport acquried the elephants in January 2006, where he stayed for the spring and summer tour and presented the elephants on Cole, until spring 2007 they performed on the L.E. Barnes & Bailey Circus.
For the 2008 tour, Will Davenport presented his three elephants Tina, Jewel & Queenie on Circus Vasquez.
In the 2009 season, Will Davenport presented elephants on the main unit of the Hamid Circus, owned by himself. He displayed a three act with Boo, Tina & Jewel. Elephant rides were offered for $8/person before/after the show and during intermission, worked by all three elephants.
Hopefully this answers your question.