Other uses of "had"

Is "had" can be used to indicate something happend in the past in a specific time frame.

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I'm attaching a picture and it seems that in it "had" is used to indicate something happend in the past in a specific time frame

For a moment the deadened look in serius's eyes became more pronounced than ever as though shutters "had" closed behind them.

Is there is anything i need to know about " had" ?