If your bike is tagged with a hazmat violation or irregularity during shipping, you will likely have to pick it up wherever it was stopped en route, and you will have to buy a new label and re-label your shipment to get it moving again. The most common reason that bikes are individually flagged as “hazmat” is because the shipper did not completely remove or completely cover ALL bulk shipping hazmat markings like these: 

For more information, see also "What warning stickers are required for e-bike shipping?".