It's a legally mandated black box. Anti-money-laundering laws in the US make it explicitly illegal to even tell you that they suspect money laundering if they

It's a legally mandated black box. Anti-money-laundering laws in the US make it explicitly illegal to even tell you that they suspect money laundering if they think you might be laundering money. (Source: 11+ years of anti-money-laundering training and quizzes in a Fortune 500 financial services company.) They are legally required to be vague and/or lie to you if they think you might be laundering money.