A packaging machine that may include a protective cover and a token fastening capsule arranged on the protective cover. The protective cover may include a receptacle that is configured for receiving a token. The receptacle may have a first contact surface. The fastening capsule may include a cap for covering an opening of the receptacle and that includes a second contact surface. The first contact surface and the second contact surface may be in contact with each other when the cap covers the opening of the receptacle. In one embodiment, the receptacle and/or the cap is provided with a knurl, the knurl being provided on the first or the second contact surface. Further, a method of fastening a token on a protective cover is presented wherein the receptacle may be cold welded to the cap in view of the structure provided above.