It is not that Feng Xingzhou failed to notice Zhou Chuan, but rather that Zhou Chuan's Cultivation base caused him to dismiss him outright. He probably guessed that the spirit sword belonged to Zhou Chuan, but he could never have imagined that Zhou Chuan was actually capable of using it.
"Your Highness, this spirit sword belongs to this customer here; it does not belong to our firm," said Xu Jingnian.
"That makes it even better! Whatever price he asks, I'll take it! I'm taking this spirit sword away with me today," Feng Xingzhou declared proudly.
Chapter 660