I am now the owner of one of those giant fake checks. The last time someone came around with a giant fake check it was a whiteboard and thus reusable, but apparently those are really expensive and it was more economical to just have a bunch of separate ones printed (also some people like to keep the giant check). They also had one for the pizza place across the street.
They said they'd tag us when they posted the picture to I don't think they said where but I doubt I'll see that because I'm only on fedi.