FBM buyer claiming I sent an empty box

I am a very small operation so I handle every aspect of my FBM selling. I sent out a item last week and the customer just messaged me claiming they received an unopened empty box.

I have an acceptance scan which clearly shows I didn’t send an empty box. I went ahead and reported the message.

Is there anything else I can do at this point? I assume the attempted mail fraud could be reported, if I bother will it in any way help if the customer proceeds with the scam?