The previously unidentified remains were found in a Florida nature preserve.
The 23-year-old had been named a person of interest in the disappearance of his fiancée, whose body was found in a Wyoming national park in September.
The articles were discovered during a search of Myakkahatchee Creek Environmental Park in North Port, Florida. Laundrie is the only person of interest in Gabby Petito's death.
Laundrie, the only person of interest in his girlfriend Gabby Petito's death, remains wanted for bank fraud.
Brian Laundrie’s attorney revealed his parents waited longer to report their son missing than they previously told the police.
He's been sought for questioning since fiancée Gabby Petito was reported missing and was later found dead in Wyoming.
"Come forward," Cassie Laundrie urged her brother, the subject of a nationwide search since the discovery of fiancée Gabby Petito's body.
Laundrie, who remains missing after his fiancée's body was found, had told police in Utah: "I pushed her away. She gets really worked up."
Cassie Laundrie said she hadn't "been able to talk to" her missing brother.
The Laundrie family attorney says the three of them camped Sept. 6-7, shortly before Gabby Petito's family reported her missing.