When you set foot in Deserted Supermarket: Every time. Only when you play the Warehouse Manager.
Details1
You say one of these
1- "Those two refrigerated trucks in the unloading area... they're company vehicles. I've been running this route for over ten years, I wouldn't mistake them."
From the game files2
ThinkExplore 601
| ID | 601 |
|---|---|
| ChapterId | 1004 |
| TriggerType | 1 |
| PlayerSelectId | [3] |
| Rate | 1 |
| RandomThink | ["EnterExplore_Market_WH_1"] |