It's pretty hilarious of how UPS, TNT and DPD advertised for their competitor saying that 'DHL is faster'.
From what I gather, the DHL uses thermal-activated tape on parcels. (Meaning the message will only be shown when heated up.) Firstly, the DHL places them on freezers so the messages won't show. It's only until they started sending the parcels to their competitors to deliver them the tape heated up and the message becomes clear.
It's a pretty funny trick and I hope DHL's competitors will see it as a joke rather than a malicious intent :d.
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