ST. JOHNS, Ariz. -- An Arizona boy charged in the shooting deaths of his father and another man kept a ledger of his spankings and told a Child Protective Services worker that when he reached 1,000, that would be his limit, according to a newly released police report.

WATCH: Boy Vowed 1,000th Spanking Would Be Last

In an affidavit for a search warrant, Sgt. Lucas Rodriguez writes that the boy "is believed to have made ledgers and or communicated in the form of writings about his intentions." He said the boy tallied the spankings on a piece of paper.

Police have said the boy planned and methodically carried out the killings of his father, Vincent Romero, 29, and Timothy Romans, 39, who rented a room in the family's two-story home in the small eastern Arizona community of St. Johns.

Documents show that Romero was shot four times, and Romans was shot six times.

In another police report released Wednesday, the boy's grandmother told police that if any 8-year-old was capable of the crimes, the boy was.

Other documents were released Wednesday by the Apache County prosecutor's office. In one of them, St. Johns police Chief Roy Melnick said that Liz Romero, also known as Liz Castillo, shouted out angrily when she was told the boy would be arrested in the Nov. 5 killings.

She said she "knew this would happen" and said she had a feeling the boy committed the crimes.

"They were too hard on him," the police report quoted her as saying. "He spent the night in my bed cuddling up to me. I had a feeling he did it."

She also said "if any 8-year-old boy is capable of doing this it's (the boy)."

The boy was released from juvenile detention on Wednesday to spend Thanksgiving with his mother.

Judge Michael Roca granted a 48-hour furlough to the boy last week during a hearing in Apache County. The boy is to return to custody by noon on Friday.

If he doesn't, Roca says an arrest warrant will be issued for the boy and his mother, Eryn Bloomfield.

An attorney for the boy, Benjamin Brewer, says he's hopeful the boy will have a good time while he's out.

Roca has said the boy must stay within a certain area in Apache County and no knives, video games or cable television can be in the home where he's staying.

A status conference in the case is scheduled Dec. 8.

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