"I had someone try to get me to put my luggage into a specific locker at a german train station. There were many others of the exact same type that was available, but someone acting helpful took me to a specific one and told me I can use it. This felt a lot like a scam and I did not use it, it wasn't the type of luggage locker I wanted anyways, so I walked away from them and used another in a place where they lack line of sight."

Is this within the allowed rules? I have googled and cannot really find any scams of this exact sort, there are people swapping keys when you're distracted but that's about it, but that seems odd to do with a specific locker so I doubt that was it. Cloned key sounds a lot more likely but I couldn't find examples.