Call 811 (the utility companies' marking service) and they will come and mark out where your gas line is (and where it ends).

"if you got called in by someone who was freaked out, where would you cap it off? "

At the meter.

Yeah if the gas was taken out the gas company would likely remove the meter and cap the line there where it connected to the gas meter, typically on the exterior of the home.

In some situations these things are due to not paying the gas bill and the person living at the home has the knowledge of knowing how to turn the gas back on at the meter.

So after so much time of repeated gas bill pay failures the gas company sends someone out to cap the gas line and remove the meter for failure to pay. This makes it impossible to turn the gas back on.

Oh, the things I have seen in this trade. LOL.

Ripping out all the gas lines that are actually *inside* a house (my parents’ old house in SoCal had the furnace in the hallway, the water heater in the garage, and the meters for gas and electric were outside in the back patio area on this small section of wall next to the sliding door - the house was on a raised foundation so the crawl space underneath was great for running all kinds of cables, wires, etc without them being visible, also lovely for resident spiders.) would be a big project and involve lots of holes in things to really and truly have it all taken out.

In reality, the lines are probably just capped at the meter so the gas simply isn’t connected for use. Call the utility and have a tech out to look at things, possibly they can even turn the gas service back on for you during the same visit.