Loofe was reported missing a day after she posted about going on an online date.
Police got their first lead on November 16, when a landlord at an apartment complex reported a strong odor of bleach emanating from the basement.
She said: "She texted me and told me about the date she had (and) how great it went and she was excited to go on another date with her again Wednesday night". She was actually at work at the time they were buying the tools, officials said.
Her dismembered body was found stuffed into garbage bags and dumped in a field in December.
Trail and Boswell reportedly gave their side of the story in a now-deleted video that was posted to "Finding Sydney", a Facebook page Loofe's family created to collect tips pertaining to the missing 24-year-old. Those charges were filed in court late Monday.
The court documents state that Trail strangled Loofe with an extension chord.
Partial remains of Loofe were found in Clay County, December 4.
Her body was discovered by the Federal Bureau of Investigation on December 5, and meanwhile Boswell and Trail are accused of handling stolen goods.
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He also told the newspaper that Loofe was participating willingly in a sexual fantasy with him and at least two other woman when she died.
"It wasn't supposed to go to the extreme it went, of course not".
'It wasn't meant that she was to die'. Each is charged with first-degree murder and improper disposal of human skeletal remains.
"A life for a life - that's the rules in my world". I should be put to death, ' he told Omaha World-Herald.
In the unsealed arrest affidavit, investigators said Trail and Boswell were captured on video at a Home Depot in Lincoln on November 15 buying tools used to dismember Loofe, hours before Loofe's death and while she was still at work.
Following her graduation, she moved to Lincoln where she took a job as a cashier for the home improvement store Menards.
Both Trail and Boswell had been considered persons of interests following Loofe's November disappearance. The pair lived together in Wilber, Neb. The arrest affidavit for both Trail and Boswell say that their landlord who lives upstairs reported a strong bleach odor coming from the basement on November 16 and into November 17.
Police say the walls looked like they had been wiped down. Boswell said in the video she and Loofe did drugs at her house before she dropped Loofe off at a friend's house. Soon, according to the complaint, police discovered more than 140 messages Boswell exchanged with Loofe on Tinder in just four days.