Bolded and underlined partly by me:
It was a real constable. KD managed to identify the officer who responded to the 911 call, but didn’t name him.
“The Star reached out to the police constable who went to check out the 911 call but he was unavailable for comment.”
Barry and Honey Sherman’s neighbours cite mysterious 911 call, visitor on day before billionaires found dead | The Star
In the same article the homeowner said they checked with both of the phone companies they used and no 911 call was made from their phones.
Another quote from the link above:
“The Star presented these two pieces of information to the Toronto police last week and asked two questions. First, could the police provide information about their investigation of a 911 call from a nearby home that morning, including the time of the call and whether police were certain it came from the homeowners’ house down the street. Second, the Star asked if it was possible that the person knocking on the Shermans’ door was a police officer in an unmarked car, who was also checking out the 911 call.
Director of communications Allison Sparkes gave the following response: “As for your questions below, we are unable to comment on any aspects of open, ongoing investigations.”
The Star went back to Sparkes, noting that it would likely be of public interest if the 911 call was related to the Shermans case, and also that, if the person knocking at the Shermans’ door was a police officer, that would also be of public interest. Sparkes said, “We can’t comment on any aspect of open and ongoing investigations.””
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On the same topic, we mentioned here before that Detective Yim made test 911 calls from the home landline and the surrounding streets using a cell phone.
ETA: There’s a Call For Service Dashboard for Toronto, but I don’t know about archived data.
ArcGIS Dashboards