I have a feeling there are two ways to tell. First, the receiver unit that connects to your computer should have two LED light on them. One will have an "A". This will be lit when the Caps Lock is on. The second LED has a "1" over it, and that's your Num Lock indicator.
The second way will be after you install Logitech's software, text will appear across bottom of your screen (usually in green) for a second or two telling you if you just pressed the Caps Lock or Num Lock buttons.
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