I just removed 30 ships from guard status. Find found one of the ships which I gave a new destination. After that, find would not find any of the remaining ships with move points. (Galaxy size = small). The ships consist of 15 transports of my desigh (range = 22) and 15 donated defenders (donated by other races "for your valiant ...").
On the next turn all of the ships were found without problem (but a turn late).