maybe, maybe not
Who leaves their car in the mall parking lot for an entire long weekend for the duped or stricken vandals to come back and wreak their own vengeance? The mall parking has a bit more security surveillance and presence, more traffic, and less long-term parking. Without those things, why would a vandal (who has already demonstrated his or her unscrupulousness) upon discovering the gift-wrapped roadkill's or ex-lax brownies' true nature, not return to slash my tires, torch my car, etc.?
Other than that, a brilliant plan.