From the 911 call:
Dispatcher: Muskegon 911. Where is your emergency?
Caller: Um. I don't know if it's an emergency. I just got out of work. I'm at the Exxon station on Sternberg Road. There's nobody here. Um, it wouldn't allow me to pump gas. I just walked inside, there's nobody. There's a car here. There's another car out front. But it's just very suspicious why there's nobody here.
Dispatcher: Did you yell or anything or...?
Caller: Yeah, I hollered 'hey' and walked around the building. I don't know.
Dispatcher: It's still open, right?
Caller: Yeah, when you walk in, the bell goes ding, ding, ding. The cashier is supposed to be there, but I don't see anyone.
...
Caller: It just seems strange. I come here after work. I come here all the time for gas.
...
Caller: I'd hate to the anyone come in and grab and run, you know.
Dispatcher: If you feel comfortable staying there, I do have an officer notified.
Caller: I'm just concerned that nobody's hurt.
**Note: The caller specified he gets out of work at 11 p.m.
http://www.woodtv.com/dpp/news/local/muskegon_county/jessica-heeringa-abduction-911-call