Courierit van parked on lawn holding firearm

Earlier today, I noticed a Courierit van parked on the lawn outside my house. There was a man sitting on the grass holding a large firearm. He then proceeded to get up and peer over the wall as my mother pulled into the driveway. We then phoned our local security company to come and patrol in the street. A few minutes later, the man got into the van and drove away. We tried calling your company directly to find out if it is a normal occurrence for your employees to carry firearms (for us to have peace of mind), however we were told that they can not help us. <br> <br> This is quite a serious matter and I would appreciate a response ASAP.