DEAR HARRY: I operate a good-size retail store in a hot mall. I have frequently had customers place collection boxes for our local hospital and for campaigns for local people who have fallen on hard times. Today, I was presented with an entirely different situation. A person wanted to place a box for a recently killed store owner's family. I did not know this man, so I hesitated. The solicitor then offered me 10 percent of whatever was collected at my checkout counter. I told him I was just not interested, because I was concerned about how much would actually go to the family. Later in the day, I sent a check for them to a church that was also collecting money for this purpose. Now, I'm really concerned about all of the store collection boxes. Is there a real problem?