The family of Theo Hayez hold out hope that Belgian and Australian police will find out what happened almost a month after he vanished from Byron Bay.
Theo arrived in the coastal town on May 29, and has not been seen since he left a bar called Cheeky Monkeys about 11pm on May 31.
Dog, foot and aerial searches have failed to locate him.
Now Belgian Police are expected to accompany NSW Police as observers in searches around Byron Bay.
Theo's cousin Lisa Hayez welcomed their arrival, saying the family hopes they can help find answers.
'It's going to help us, the most people on the case the better it is,' she said in Byron Bay on Sunday.
'I know they're going to do it.
'If the Australian police and Belgian police work together it's going to be faster and everything. That's the point.'
Theo Hayez's father Laurent Hayez (pictured left) and cousin Lisa Hayez (right) spoke to media at a special event organised to search the missing Belgian backpacker. Ms Hayez says the family hopes Belgian Police officers, who are expected to arrive in NSW soon, can help find answers
Vinciane Delforge (L), mother of missing Belgian backpacker Theo Hayez, was consoled by counselling and spiritual healer Lani Sidoti during the special event held at the Byron Bay Golf Club
The exact arrival date for Belgian Police is not yet known.
Theo's father Laurent Hayez thanked volunteers for conducting a coordinated search for him on Sunday.
'The support they bring to us (gives) us the force to keep face,' he said.
'Without all the support in Belgium and here in Australia I think we would be on the couch with tissues crying every day.'
He declined to comment further on the official investigation, saying simply that the family 'trusts the police'.
'Thank you to all of you, thank you to the Australian people,' he said.
'A beautiful country, a beautiful people.'
Theo's father Laurent Hayez declined to comment further on the official investigation, saying simply that the family 'trusts the police'. He thanked volunteers for conducting a coordinated search for him on Sunday
Mr Hayez pleaded with encrypted messaging service WhatsApp to divulge Theo's communications.
WhatsApp provided what it could to investigators - limited metadata - but a spokesman told AAP they are unable to decrypt and pass on the content of Theo's final known messages.
Theo's family said they will remain in Byron Bay indefinitely.
'We don't plan to go home or anything.'
Dedicated volunteers (pictured) conducted a coordinated search for missing backpacker Theo Hayez on Sunday
Dozens of volunteers combed through Tyagarah Nature Reserve, north of Byron Bay in New South Wales, in a desperate attempt to find the backpacker
On Sunday dozens of volunteers combed through Tyagarah Nature Reserve, north of Byron Bay in New South Wales, in a desperate attempt to find the backpacker.
The search was organised by Byron Naturist group, in Tyagarah. Many of the group's members have been searching for Theo since he was first declared missing.
The 18-year-old had been travelling through
