My reading of the memo (which references its sources for these statements in the footnotes) is that on the day when the poor girls were found (14th Feb '17) that EF made such a fuss to his sister claiming that he was involved/ witnessed the murder of two girls by a bridge, and that he placed sticks above the head of Abigail.
We haven't seen and nor would we want to personally, the crime scene photos. But the description given by the D who have seen them is that EFs confession includes description which bears a strong resemblance to the crime scene, which given how unusual it has always been described as looking, is quite an uncanny thing IMO - well before texts, rumours and the like could have possibly influenced EF or his sisters.
On page 1 of the Odin report, Mary Jacobs told law enforcement that on February 14, 2017,Elvis was rambling, hyper and borderline incoherent. He was talking about having a “brother”(even though Elvis had no male siblings) and was now part of a “gang.” Elvis told Mary that he had been on a bridge with two girls that were killed. Elvis told her that someone named Abigail was a pain in the *advertiser censored* and a troublemaker. She said Elvis tried to give her (Mary Jacobs) a blue jacket. She told him that she had her own jacket.
After Elvis made these statements to his sister, Mary Jacobs, she later became aware of the Delphi murders and put two and two together. Sometime 2-3 weeks after Elvis made the statements, Mary Jacobs and her husband (Troy) drove to Delphi. While in Delphi, March Jacobs talked to law enforcement about the things Elvis had told her on February 14, 2017, but “due to the mass amount of tips that were generated, her information may have been overlooked".
In December 2018 Mary Jacobs enlisted the help of an old acquaintance of hers named Misty Moore. Since law enforcement had not followed up with Mary Jacobs from earlier in the year when she drove to Delphi and described what Elvis had told her, Mary was still concerned that Elvis was involved in the murders, but nothing was being done about it.
In Mary’s “Pre-examination interview”, polygraph examiner Stephanie Thompson recorded that Mary Jacobs stated the following: “Elvis told her (Mary) Abigail is a little troublemaker, that he placed leaves on her and used sticks to give her horns ".