A shop that dropped out of the Map Pack's top 3 would notice by Tuesday and move heaven and earth to get back. A shop that's never been there has nothing to notice — there's no alarm for a search you were never part of. This checks whether you're in it, using only your public Google Business Profile. Nothing is shared or contacted without you running this yourself.
These decay the moment you stop working them. Competitors who are actively earning reviews pull ahead of you here every month you don't.
Good practice, but no documented effect on your Map Pack rank — these are trust and conversion signals, not ranking ones.