Not personally lost anything significant YET but
I was fishing with my brother in law a lot of years ago and he had a brolly blow in
does that count ?
a mate of mine lost a John Wilson twin tip the old green one in the Severn at Bridgnorth, i managed to catch it again for him but it did take a couple of hours
found an ron Thompson buzzer and bank stick
And pulled a quiver tip and closed face reel out of the thames found loads of floats and stuff like that