The Richmond Daily Dispatch list some casualties, see for example:

The Daily Dispatch: February 16, 1864.

Richmond Dispatch.
Tuesday morning...February 16, 1864

The fight on John's Island.

--A dispatch from Gen. Wise, dated at Fripp's, John's Island, at six P. M., of the 11th, reports that the enemy came up in force, when we opened fire upon them at twenty-five minutes past three o'clock. The enemy ceased firing at forty minutes past five o'clock and retreated, with our cavalry in pursuit. They left some wreck behind of small arms and disabled horses. In this engagement we lost none in killed. One man severely and another slightly wounded, and one missing, are reported as the total number of casualties. Capt. Tennent, of the 59th Virginia, was wounded, and is missing.