Don't sweat...be thankfully that it could have been expensive golf clubs or expensive items which is worse...
I noticed the price for hard-steel tips darts ranges from under $9.99 to over $60 so that can't be bad and it's not a life-threatening either! 
You seemed to be sweating in panic as if its worth $1,000 or something. Things will turn out ok for you, I am sure.
