See, this is were we're wrong. For us, the lampost is very significant because we read the stories and it's a central part of the Narnia lore, but in HBB, it only says that Lucy told the tale of the wardrobe. It doesn't mention the lampost at all so it is possible they forgot about it (though not completely), and the exact area where they came into Narnia.
We the readers can see the significance of the lampost. Lucy and his siblings only saw it in passing. Compared to all their other adventures in Narnia, the lampost was an insignificant event, and probably at that time, they did not even pay attention to it because they were used to lamposts in London. When they saw it again shortly before their return, they did not recognize it, but their unconscious was trying to send the images back to the surface, so to speak. When you look at that way, the dialog at the end of LWW makes perfect sense. .
We the readers can see the significance of the lampost. Lucy and his siblings only saw it in passing. Compared to all their other adventures in Narnia, the lampost was an insignificant event, and probably at that time, they did not even pay attention to it because they were used to lamposts in London. When they saw it again shortly before their return, they did not recognize it, but their unconscious was trying to send the images back to the surface, so to speak. When you look at that way, the dialog at the end of LWW makes perfect sense. .
