You are correct, I made mistake based on the information source. Here is a correction:

Boyd officials are unaware of the damage to their casino, Treasure Chest in New Orleans, there two other Louisiana properties (not in New Orleans) were uneffected.

Boomtown officials report minor damage to possibly moderate, but is expected to reopen after repairs. (no timetable)

Harrah's appears to still have suffered minor damage and will reopen no earlier than September 30th.