A watch missing from a locker is frustrating, but a quick, organized response is more useful than an argument at the front desk. Prioritize your safety and make a factual record.
Notify the facility and local authority
Use the gym's formal incident process and ask for a written acknowledgment. Report the suspected theft to the appropriate local authority and keep its reference number. If cameras or access records may be relevant, ask the facility to preserve them through its own process; privacy rules may limit what it can disclose to you.
Write down the timeline
Record arrival and departure times, locker location, when the watch was last seen, and when you noticed it missing. Keep your membership or visit record and any relevant messages. Avoid naming a suspect unless you have direct evidence.
Prepare the watch description
Provide a verified serial, model, photographs, and distinguishing marks when asked. Contact your insurer and check its notice requirements. Keep copies of reports and correspondence.
If a possible listing turns up, preserve its public information and pass it to police. Do not use the listing to arrange a private recovery.
Make the Watch Easy to Identify
Keep serial and ownership evidence ready for the report and any later status check.