The term 'CHECK ATTACHMENTS' can be broken down into two crossword solutions: REINS (5 letters) and PAYIPS (6 letters). REINS is an acronym for 'Reinsurance', which is a form of insurance purchased by insurance companies to protect themselves from the financial consequences of a large loss. PAYIPS stands for 'Payment Interchange Processing System', which is a system used to process payments between banks and other financial institutions.