On Thursday, RCMP were notified by campers in the Fosthall area that a van that appeared to be stuck and had not moved for approximately five days.
Family members confirmed to police that Chun had left Burnaby in that van to go mushroom-picking with a friend, though he did not tell them where.
The friend said that Chun left the van to go picking, but didn't come back. The friend said he waited around for a bit, but then walked to the highway and hitchhiked to Revelstoke, and eventually made his way back to the Lower Mainland but did not report Chun's disappearance to police.
Police say Chun's van was at a base camp the two has established about an hour's drive into the bush after taking the Arrow Park Ferry south of Nakusp.
Local search and rescue volunteers conducted searches on Thursday and Friday, but did not locate the missing man.
Police are asking anyone who may have seen Chun to contact a local RCMP office.