I was selling my science fiction books at book signings and online and had a guy want to place an order online and send me a check for several instead of paying online. I agreed. He sent me a check for a thousand dollars, asking for several books and me to send him a refund check of $950.
I didn't send him my books, but I did report him to the police, they didn't care, reported him to the bank, they acted.
So no, not scammed, but I've had similar things tried since.