From the pinecountynews article, he never arrived.
"The next morning (day after fathers day, so monday the 19th) the hat and other Father’s Day mementos were tucked into a box along with some salami, homemade bread and pickles. Dad would be staying with grandpa in the Cities, as he occasionally did when he was hired to do some painting. This one was an inside painting job – a two-story apartment building.
Dad told Mom he expected to be finished on Wednesday and would be home late that day. If he ran into problems, he would call and be home the next day.
I made it home from my shift that Wednesday about 11:30 p.m. Dad hadn’t made it home yet. Mom said he had not called so he’d probably be pretty late. We all went to bed.
He didn’t come home the next day and he didn’t call. Mom planned to call Grandpa if Dad wasn’t home Friday morning.
Bright and early Friday morning, she called before going to work. Grandpa said he had not seen Dad at all. Mom called several friends in the metro area. They had not seen him."
So yeah no contact on Tuesday, I guess they assumed he was working? But you would think the Grandpa and the client were expecting him.
As for the car it should still be around. This couple was missing for 75 years and their car was found in 2001.
Mystery of Missing Couple Solved in Deep Washington Lake After 75 Years