Green’s Dictionary of Slang

(US) to defraud, to swindle.

1875		Chicago Trib. 1 Oct. 4: In a back room of some large building [...] they are ‘confidenced’ of what money they have about them [DA].
1880		Missouri Republican 15 Feb. n.p.: Detectives [...] arrested Lawrence Stanley [...] on a charge of confidencing Henry Mueller [DA].
1942		Z.N. Hurston ‘Story in Harlem Sl.’ in Novels and Stories (1995) 1004: Best you can do is to confidence some kitchen-mechanic out of a dime or two.
1971		R.D. Pharr S.R.O. (1998) 99: ‘Man was I dumb [...] I was dumb to be confidenced’.