The AP story does not include many of the details.
Below is link to EMOL (El Mercurio online) that I read last night. The documents that were allegedly found in a house of a military officer were said to contain results of an autopsy taken the day Allende died in La Moneda. It said there was evidence of wounds from two different weapons.
(Spanish)
http://www.emol.com/noticias/nacional/detalle/detallenoticias.asp?idnoticia=484460 Today, the Allende family was considering legal action against Television Nacional, which is controlled by the Pinera government.
The family's attorney said the TV report was aimed at muddying the ongoing investigation into his death. The family has publicly accepted that Allende committed suicide.
http://www.emol.com/noticias/nacional/detalle/detallenoticias.asp?idnoticia=484689-------------------------
This is really a strange development, with government-controlled TV saying that Allende may have been assassinated, and the family angry over the airing of the documents found in a home that was being demolished.
There will be more to come.