## 1 Introduction  
Parcel services often face problems when sent packages are damaged or delivered to the wrong address. During transportation, the shipment can be repeatedly reloaded from one vehicle to another and to various logistics centers. During this process, there is a high probability that the shipment may be physically or mechanically damaged at some part of the shipping route [1; 2; 3]. This can happen during reloading due to the carelessness of service personnel or the failure of reloading conveyors or robotic systems. Also, the parcels can be damaged during transportation when there are high vibrations due to external factors such as the quality of the roads or turbulence (if the parcels are transported by air). Certain mechanical damages may also occur during the shipping of parcels by sea, as storms, large waves, and other factors are possible during the journey [4; 5; 6; 7]. Such violations of shipments and their contents can cause huge losses for individuals, e.g., for remote buyers. Huge losses can also be received by companies that remotely purchase various expensive technologically complex industrial equipment, for example, sensitive machines, computer equipment, medical devices, etc. The sooner the manufacturer, carrier, or customer learns that the transported item may have been damaged during transportation, the sooner they will be able to take steps to reduce unnecessary costs [1; 8; 9; 10; 11]. In order to ensure that the parcel reached the recipient it was sent to, especially for more valuable parcels (e.g., a laboratory bench), shock indicators are used (in English it can be called a shock detector, shock indicator, or impact monitor). The impact indicators, as a binary system using only \(0\) and \(1\), indicate whether the impact threshold has been exceeded or not. A measuring device similar to them is a shock recorder that measures force magnitude over time. This is more often used when the combination of force and duration of impact is not known, which may be dangerous, because, for example, a short 1 ms 300 g hit causes little damage and is generally not interesting, but a 20 ms 300 g hit could already be critical. Shocks are vector quantities whose direction is relevant to the object being acted upon, so shock detectors can also be very sensitive to the direction of the input shock. \"ShockWatch 2\" impact indicators are disposable binary system devices that determine whether sensitive products have been dropped during transportation or storage [1; 2; 12; 13; 14; 15]. These indicators are field-activated tamper-proof devices that turn bright red when a hit occurs above a certain threshold. Each one has a unique identifier to help with traceability. The ShockWatch RFID works in the same way as the ShockWatch 2, only with additional RFID functionality. Therefore, every time a package or item is scanned remotely using an RFID reader, its status is automatically entered into the Enterprise Resource Planning (ERP) software or warehouse management system. This impact indicator no longer needs to be checked by a human, as it is automatically registered in the relevant system. \"ShockDot\" are tamper-proof mechanically activated indicators [3; 4; 16; 17; 18]. They turn completely or partially red when a potentially damaging impact occurs. Each indicator has a QR code that allows the user to verify the authenticity of the indicator and assure the user that the device has not been changed during transportation [19; 20; 21]. For the ShockDot indicator, it is important to choose the mounting position responsibly because it does not react to shocks perpendicular to its own plane, although its sensitivity is not affected by the axial orientation in its own plane. The ShockWatch MAG 2000 shock indicator is a resettable and reusable device for monitoring fragile goods and cargo containers over 200 kg. The device is also widely used in railway and truck fleets to monitor the presence of excessive shocks when pushing or coupling wagons and trailers [1; 22; 23; 24; 25].