Just throwing out possibilities: 1) We don't know for sure that's true. At the moment, that's hearsay. There's no evidence to prove that she was or that he said that outside of JW saying that. 2) If he did, in fact, say that, maybe he didn't discover it until after she was reported missing? It's odd to me that JS would have had personal bank statements to even look through to begin with. That would indicate he either went through her personal mail or accessed her online bank statements (both illegal) or there was some pending litigation and the statements had been subpoenaed.