The standard Cash Audit is limited and cursory.   Beginning and ending balances match?   Check!   Move on!    But there is so much more that can be done in order to really look for problems - errors and fraud.   Auditors are looking for problems beneath their threshold of immateriality.   But owners should want to find ALL misconduct and errors.  

Cash is often poorly diligenced because of the volume of data, the quality of the data, and available resources.