Gwen's Head spawn locations

Is it true that this gun will only spawn in 5 different locations as the wiki says? Because I’m pretty sure I found it once in a box next to a vending machine just outside the entrance to The Highlands. And the other time I found it in the train station, I’m almost sure it wasn’t the one specified in the wiki.

This is where Gwen´s Head spawns: (red crosses)

Yes well, that is the same as the wiki, nothing different there.

The train station is one of the official five locations. I’ve never heard of the Highlands exit being a source before. Then again, I very rarely go that way…