Bob Gardner wrote:

As I understand it, he received a call this afternoon wondering where
he was. They were out looking for him in Canada.

It seems as in Canada they treat a filed IFR flight plan *similar* to
one that is activated. IF you don't go, remember to cancel, or they
will send some one out to look for you.

How would the Canadians even know he had filed? Until he takes off the
next sectors down the line don't have a clue he has even filed.