The following tale is presented in a great deal of books and has been a mystery for a number of years. Eventually it was debunked by Jordi Ardanuy. In the end he traced back the origin of the story to a writer called Alfonso Sastre. And he even managed to get a signed confession out of him which stated that the story was made up.
It would be easy for me to make an article but I prefer to leave the credit to the author so I added his text:
The journey of the damned coffin by Jordi Ardanuy.
Here`s the basic of the story [once again I encourage you to read the full text]
A coffin arrived in the harbor of Cartagena and it was sent on a land journey to A Coruña. On the way it did several stops and in those same locations [and in the vicinity] vampiric activity was reported. The strange thing is that the coffin wasn`t picked up at A Coruña and it was eventually resent to Cartagena – where it was taken by a Serbian nobleman.