She did in fact confirm that she returned it to the same store.
It's right here, at 3:41
Prosecutor Juan Martinez's "Perry Mason" Moment - Busts Jodi Arias For Lying About Gas Cans - YouTube
Juan: And you said you returned it back to the store in Salinas, correct?
Jodi: That's correct.
Juan: And it's the same store that you bought it from, right?
Jodi: Yes.
Juan: Probably because it was in the same general vicinity, right?
Jodi: Right.
Good catch...she is effed when the jury wants that testimony read back.