Final answer:
Under the FLSA, collective bargaining agreements are the only records not required to be retained for at least three years.
Step-by-step explanation:
Under the Fair Labor Standards Act (FLSA), employers are required to retain various records for a certain period of time. However, not all records have the same retention requirement. One exception is collective bargaining agreements, which are not required to be retained for at least three years from the last date they were in effect. On the other hand, timecards, certificates authorizing the employment of minors, and records showing total sales volume and goods purchased must be retained for at least three years.