A key clue is missing from the home of a family who disappeared on a camping trip after visiting Walmart

A MISSING item could be a crucial lead as police investigate why a family disappeared a month ago after setting off on a camping trip.

Jill Sidebotham, 28, and her two-year-old daughter Lydia were last seen by family on June 27.

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Jill’s father, Ron, told Seacoastonline that a cash jar that Jill kept at home, containing an estimated $200 in cash, was nowhere to be found following her disappearance.

Jill was last seen with her ex-boyfriend Nicholas Hansen and their toddler daughter Lydia.

Jill told her mother that the family was going on a camping trip, although Jill’s mother had reportedly warned against it.

On June 28, Sidebotham’s phone was cut off, and on June 29, Hansen’s phone was also unavailable.

Jill and her daughter were scheduled to return on June 30, but they didn’t.

The last known sighting of the family was on July 2nd at a Walmart in Mexico, Maine.

Jill’s fiancé Corey Alexander said he got Facebook messages from her in late June.

He said: “I’m not sure if they actually came from her phone or not.”

Alexander told Jill he loved her when he replied to a text she reportedly sent.

Jill replied: “Love you too and have a good day (sic).”

Alexander then replied: “You too baby.

Alexander doesn’t believe Hansen sent the messages but said he fears if he had seen them “they might have triggered him”.

Warnings to the family have been posted throughout the Northeast.

“She just doesn’t care about doing that,” Jill’s father told Seacoastonline.

“There are so many factors preventing them from doing that voluntarily.”

Ron said that Jill would not leave her 10-year-old son.

“She loves her son, she adores him,” he said.

Ron also told the outlet that he believes the police are doing everything they can to find his daughter and grandchild.

He said he and his wife appreciate all the effort people are putting into social media and handing out flyers.

“Don’t give her up,” he said.

“Don’t give up on us and don’t give up on the baby — that goes without saying.”

The Sanford, Maine Police Department released online surveillance footage of the family camping at Coos Canyon Campground in Byron.

The footage shows both parents carrying their daughter, who is wearing a red top.

The mother wears a black T-shirt with green print, glasses and light-colored shorts.

When spotted at a Walmart on July 2, surveillance footage showed Jill paying cash for groceries.

Jill’s phone isn’t taking calls and her credit cards haven’t been used.

As The Sun previously reported, Jill’s fiancée said the trip was “unexpected and made no sense”.

“I’ve never felt so much pain,” Alexander said.

“Without her, I’m completely lost. It just tears me apart.”

Matthew Gagne, Lt. of Sandford Police, previously told The Sun: “There is nothing to suggest they are in any danger.”

The search has been hampered by geographic challenges in the state, Lt. Gagne.

Most of Maine is remote with small populations and poor cell service, the Sanford PD lieutenant added.

“We are working with other jurisdictions to follow up leads,” Gagne said.

“We hope they’re still in the area, but we just don’t know where they are right now.

“Because it’s not a criminal matter, we’re limited in some things.”

Police have asked the public to look out for a silver 2005 Volkswagen Jetta with license plate 1563VJ from Maine.