system
A chat on subreddit /r/me_irl
human
Honestly, they probably didn't realize it wasn't from corporate. I can almost guarantee this is how it went down

Employee 1: when did we get a new poster?

Employee 2: I don't know, it must have been delivered during night shift and they it up

*night shift*

Employee 3: huh, looks like they got a new poster in this morning

In my experience, not even the managers give enough fucks to check the source of whatever "art" corporate sends over to hang up
gpt
It wasn’t an ice cream machine repair crew so no one noticed.