An arrest has been made, police have found Bosma's cellphone and what they believe to be the truck he was last seen in and have received over 500 tips from the public. But there's still no sign of the young husband and father.
Police have obtained search warrants and they're concentrating their efforts on the Kitchener-Waterloo area, Const. Debbie McGreal-Dinning said Monday.
Waterloo Regional Police Services (WRPS) are on hand to assist, but the investigation is still being led by Hamilton police.
"We have a liaison officer, an investigator, assisting the Hamilton police while they are in Waterloo region, and that's basically for local support and knowledge of the area if there is anything Hamilton requires," WRPS Insp. Kevin Thaler said.
"The purpose for Hamilton staying with this investigation entirely is obviously they have begun the investigation. To use partner agencies is always welcome, but at the same time you then have to add officers from other police services to your witness lists, to any preparations for courts, and it can add costs to the investigation."
An arrest in the case was made Saturday. Police charged Dellen Millard, 27, of Toronto with forcible confinement and theft over $5,000.
Police had found Bosma's cellphone in Brantford earlier in the week. Late Sunday, they confirmed they had found a truck inside a trailer parked in the driveway of the house of Millard's mother, Madeleine Burns.
- Read a statement from Tim Bosma's family
Millard appeared in court Saturday via video in Hamilton. His next court appearance is Wednesday, for a bail hearing.
An accomplished pilot from a young age, Millard once held the world record for the youngest pilot to take a solo helicopter flight, when he was 14. Millard's family ran and operated Millardair, which chartered flights out of Toronto and, more recently, Waterloo.
Suspect's home raided
In recent years, Millard took up racing, and had an interest in repairing and restoring cars and trucks. He and a friend are listed as racers in the 2011 Baja Race, an off road desert race in Mexico, and Facebook photos show the pair's trip to participate in the event.
Earlier this week, Millard's home was raided by Toronto police, neighbours said. He lived there alone after his father died six months ago. He was last seen by neighbours Wednesday evening working outside on his house with a few other men.
- Missing Ontario man's truck believed found
Neighbours also told CBC News they were shocked by news of Millard's arrest and described him as "a normal kid."
Hamilton police's investigation into Bosma's disappearance has taken them across southern Ontario, with assistance from several other municipal police departments and the OPP.
- Tim Bosma investigation leads police to Brantford, Ont.
The search began close to Bosma's home in Ancaster where he was first seen but quickly expanded to Mississauga where a witness told police two men who fit the suspects' descriptions test drove his truck, also a Dodge Ram 3500, on Sunday, May 5.
The investigation then took police to Brantford after they located Bosma's cellphone in an industrial park near Oak Park Road. Police began reviewing local business surveillance to follow up on reports that Bosma's truck was spotted in West Brantford last Monday night.
Following Millard's arrest in Etobicoke, police were spotted on scene at the Region of Waterloo International Airport in the Millardair company hangar. By Sunday, they had descended on Burns's home in Vaughan, creating a web of leads across the lower part of the province.
As of Monday morning, police were still on scene at the Millardair hangar in Waterloo, including the Hamilton Police Services forensic truck.
Truck found, but Bosma still missing
Neighbours told CBC News they were woken up late Thursday night to the bright lights and noise of a truck backing up. It dropped off the trailer in Burns's driveway and left.
On Sunday, around noon, police descended on the property. By that night, as police towed away the trailer, Hamilton Police Services confirmed there was a truck inside the trailer they believe belongs to Tim Bosma. Now, police tell CBC News they are looking for video surveillance from homes on Tinsmith Court, the street where the trailer was found.
Neighbours told CBC News the lights of the truck were so bright, they couldn't make out a licence plate. They also noted they haven't seen Burns all week.