Should we worry about hours worked (or not worked) at home?

Q: During the last storm, several nonexempts didn’t have any paid time off available and we didn’t pay them for the days not worked. They’ve since claimed that they worked at home catching up on paperwork, even though this wasn’t directed by management. Most of them work on a manufacturing line, so we’re dubious that they “worked” at home. Could this get us in trouble if we’re audited?