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Man0verBoard said..
What about the bit of gear you leave where you rigged your sail the come back 10 min later and it's vanished without trace..will it show up on someone else's manifest?
It will show up as a double-count on the thief's list

Throughout my years of windsurfing, I have only known of a case where rigged up sail was stolen in broad daylight ! The sail and the carbon boom were brand new. The owner got complacent and left it unattended while having lunch.
Windsurfers in general are very community minded and honest. I often wonder why some folks left their full array of expensive equipment at the back of their utes. Easy picking in my opinion. Yet, I have not heard of "involuntary extraction". The rare acts of theft probably were carried out by some drug addicts looking for easy cash.
For me, I lock up my wagon while on the water. Anyway, my equipment is not worth pinching as they are mostly secondhand and patched up with sticky duct tapes all over !