It was searched but not dug up. The PJ only got ground penetrating radar four years ago.
A correction is needed. Portugal has used georadar technology much earlier than 2007 for various purposes, and it was used when searches were performed in Jul/Aug 2007.
I've no patience to go over the files, but I can give a reference from a news article in
Jornal de Notícias, July 6, 2012, paper edition, page. 14, translated in full at
http://joana-morais.blogspot.com/2012/07/attorney-generals-office-and-expert.htmlFernando Almeida. Associate Professor, Department of Geosciences at the University of Aveiro. Specialized in Geophysics, [ «In August 2007 I joined an international team, among which was the English investigator Mark Harrison, to perform georadar surveys in Murat's residence. The work was exhausting, lasted two days and involved over 20 people.»], when responding to Birch's allegations:
"Fernando Almeida, the expert in Geophysics and professor at the University of Aveiro that participated in the investigations done with georadar to Murat's house back in 2007, says that the signal that was detected [by Birch] may correspond to objects, debris, rock fragments, supply pipes, etc... and he explains that “this method always requires confirmation by excavation, otherwise the interpretations are only hypotheses”.
P.S. It's good to see that some serious discussion is actually possible.