There is a restaurant very close to where I live that I have never dined at. However due to a mystery shopping opportunity, I did visit this restaurant. Now about a week after the visit, I have a mailing from the restaurant addressing me by name, not just as general junk mail advertising! And I did not give the location my name as it was an unrevealed shop and I paid with cash.
Of course this may just be coincidence, like the restaurant bought my name from a mailing list.