Back then, Xu Lei had stolen the Puppet-Exorcising Bell to drive Bai Ling away.
However, after those two Enchantresses killed Xu Lei, they didn't take the Puppet-Exorcising Bell with them.
That was because Xu Lei hadn't placed the Puppet-Exorcising Bell in his Qiankun Cloth Bag at the time.
At that time, Xu Lei was, of course, only carrying a single Qiankun Cloth Bag.
The rest of his things had been transported and hidden in a cave in the Great Xing Mountain Range.
That Qiankun Cloth Bag was indeed taken by the two Enchantresses.
However, there was nothing of value inside it.
As for the Puppet-Exorcising Bell, Xu Lei had left it in the carriage.
The carriage was blown apart by Mei Xiong, and he hadn't even noticed that the bell was a Magical Artifact.
He probably just thought it was some kind of ornament for the carriage.
In any case, the two Enchantresses left quickly after that.
Thus, the Puppet-Exorcising Bell eventually found its way back into Bai Ling's hands.
