The chain was used in March to prop open an emergency exit door at a subway station as part of an Occupy Wall Street action to allow passengers to ride free.

The police later released surveillance video of people in dark hoods and masks wrapping a long silver chain around the emergency exit door.

Officials said they had fed the DNA from the chain into a database, hoping to find the perpetrators. A computer indicated that some DNA matched that on Ms. Fox’s CD player.

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