Hmm.. But why would any of that cause somebody enough concern to call the cops and report a “suspicious person”?
Because some people are hysterics.
My husband had to take my car to the garage. Afterwords he drove to where I worked to pick me up. Since he was an hour early he decided to tip the seat back and take a nap.
Despite the fact he was parked in my assigned spot in my car someone got so upset seeing him there that they came in and wanted the receptionist to call the cops.
Thankfully the receptionist looked out and recognized him and told the little nut case to go take a chill pill.
“Hmm.. But why would any of that cause somebody enough concern to call the cops and report a suspicious person?”
Are you kidding?
Listen to the police frequencies some time.
People call the cops and report suspicious people all the time. There are people who call and report a car parked because they never saw it before. People report “suspicious vehicles” if someone is changing a tire, if someone drives slowly through a neighborhood looking for an address, if someone rolls down a window and asks for directions, you name it.
There are people who love any excuse to call the cops. They don’t need anything to cause them “concern”, they are just busy bodies who like to stick their noses into everything.
Earlier comments already listed a wide spectrum of possible reasons, starting with simple and common paranoia.
I can suggest one more theoretically possible reason. Husband and wife work at the same business. The wife is suspicious of fidelity of her husband. She looks into the window and sees a pretty woman in a car who is apparently waiting for someone. The husband is scheduled to go somewhere... The wife dials 911 to "teach that #$% a lesson."
Plenty of people in modern society are eager to call the cops at the slightest provocation or infraction.
Someone pulling over to check their phone or a map for an address or to verify directions? Clearly suspicious and reported.
A neighbor putting up a fence someone else doesn’t like the color/height of? Reported.
Someone changing a tire on a residential street? Reported.
Someone letting their school aged children walk to the neighborhood park unattended? Reported.