Mains ground on B&K av5000 question

I just received my new to me amp. I opened it up for a visual inspection before plugging in to the wall. I notice there is no ground on the IEC receptacle. There is also n empty ring connector on the star ground. Did these units come like that from the factory? I know my Denon receiver has a 2 prong IEC receptacle, so not sure if I need to connect a ground to the amp. I assume that the ground is lifted to reduce hum.
 

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