ABC Company has instituted good internal controls and has never, until last month, had a problem with fraud. But several weeks ago, someone with access to keys entered the controller$$s office and took two company checkbooks. Since then, several checks have been forged totaling $$5,670.$ You are a certified fraud examiner and have been recruited to investigate the case.

Which theft act investigative method$($s$)$ should you use in this investigation?