We found these lost passengers safe and sound in Walking the Plank. They hadn't been there long - we think we might have been following Darrah around their cache trail about 10 minutes behind them.
We will be passing through the Netherlands on our way to Scandinavia in June, but unfortunately not before then. So, to help them on their way, we'll move them to a cache in the south of England, and hopefully someone else can get them to their goal quicker than we can. Good luck on your journey!