A bumper reinforcing member formed of a resinous material is provided between a bumper fascia and a vehicle body. In this method, a magnetic paint having a solid concentration NV of 3\u2266NV\u22668 is applied to a non-magnetic underlayer formed over a non-magnetic support to a wet film thickness Tw in a range of \u22662300. Each lockbox owner specifies and controls who or what can provide what information to the lockbox, who or what can access what information stored therein, and when and how the stored information is accessed.