They do it different ways, sometimes they are all known to each other, others it’s an identifiable item. Agents from all over the country can board flights to somewhere, all show up independently, work a subject or place together because they all got the same duffel bag overnighted to them the night before they left. Common looking but with some unique identifier as they were all custom made the day before for this mission. Good money in government ontracting at silly prices. Watches, stripes on socks, pins…. All possible.