The Laptop Dongle is located on the top floor of Palais de Walewska, inside the palace's attic. It can be found lying ontop of a box within the security center in the south western part of the attic. It is reachable without getting spotted and without taking any guards out but you should still be careful when sneaking up to it, and you may need to wait for a guard to move or use a distraction such as a coin, if needed.
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