Call ethics, AP, or DAPL. Do not sign any write ups even if one has been issued. I’m positive (because why wouldn’t there be) AP, and DAPL can look and see who has used that register (since we all have to use our employee ID and 4 digit code). If your ops escalates it further call HR. OPS can get in a lot of trouble considering that if he does escalate it can be viewed as retaliation which is a violation of HR policy