Ben’s sister, Leigh-Anna Needham, told ITV’s Good Morning Britain that the police had found a toy car that the family and Ben’s grandmother believed belonged to Ben.
"She is 90% sure, it is similar but we cannot be 100% sure," she said.
Ben's mother, Kerry, told The Daily Mirror that "one man has taken a secret to his grave."
The BBC reports that a friend of a local digger driver, Konstantinos Barkas, who was clearing land with an excavator on the day the toddler went missing, may have been responsible for Ben's death.
The witness says the child wandered on to the work site around midday, and Barkas had not seen him amongst the swirling dust and crushed him unde the wheels of the digger.
The witness’ story led police to begin digging at the site last month where they found the toy car.
Barkas died of cancer in 2015 but his widow and son have strongly denied the claims.
"It’s been 25 years and they have found nothing at all – not a shred of evidence to support these wild allegations against my father,” Valantis Barkas told the Daily Mail.
"My father has been accused of being a child killer and his picture has been published everywhere without a trace of evidence.
"I have remained calm throughout all of this. We have nothing to hide. We have tried to help [the Operation Ben police investigation].
"It is too easy to blame the dead. My father is dead and his name has been dragged through the mud. He was a beautiful man. He was well respected."
While police believe they have solved the case, they are not yet closing it.
"We remain committed to the investigation and it will not simply close; myself and Detective Superintendent Matt Fenwick will retain ownership of it and if new information comes to light, we will investigate it thoroughly," added Detective Inspector Jon Cousins in his statement.