Animal dung is the perfect fertilizer, so use it well! Whoever sent you the shit must have thought about your flowers.
For example elephant dung is especially highly recommended as a fertilizer for roses. There will surely be someone in your family who will appreciate this precious material.
We also strongly recommend you to think very hard about who might have been the sender of your shit (if he is a craven and leave no signature) and award him with the shit present of at least the same size too.
You can order the payback
here.