Open it before you sign anything if you can, and call (914) 825-5498 straight away.
Transit damage is never your problem, in either direction. We will overnight a replacement part or a complete second kit at our cost.
Photograph the box before you unpack it. It makes the carrier claim faster, though that is our job, not yours.
Didn't solve it? Text (914) 825-5498. If it's your event night, lead with that — those go to the front of the queue.