Another place to look for "spy ships" is in the corners. If your opponent (anyone spying on me is an opponent) has a darker colored shipset, they can be hard to spot in the corners. Especially in the top left, under the name of the system.
Nick (bearclaw)
(that one's for you, Flatline.
)
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"You don't know the Power of the Dark Side. I must obey my Master"