A 'paper ghost story' could be a ghost story that is written on paper. It might be a traditional horror tale, perhaps passed down through written manuscripts, like the old horror stories in books or on parchment.
In Japan, there is a story about a paper cutting artist. He cut out a very unique ghost - like figure. His neighbors started to spread rumors that they saw the paper - cut ghost floating around his house at night. The artist himself thought it was quite funny. He explained that the unique shape of the paper cutting and the way the light hit it at certain times might have created the illusion of a moving ghost.
It could be anything really. Maybe it was a confession from the ghost or a map to a hidden treasure. Sometimes, it's just a random symbol that holds some special meaning known only to the characters in the story.
Once upon a time, there was a little girl who received a gift wrapped in old, tattered wrapping paper. When she opened it at midnight, a ghostly figure emerged from the paper. It was the spirit of a long - lost toy maker. The ghost told her stories of the toys he used to create before he passed away in a tragic accident in his workshop. Scared but also intrigued, the girl listened until the first rays of sunlight made the ghost disappear.