Ginko's world doesn't have anything like demons that can be contracted with, really, so he wouldn't particularly have anything to compare it with; despite the fear in his own memory, Ginko as an adult bears no ill will against the Tokoyami in his eye. It was simply living, just as he was. The result is unfortunate, but there's nothing that can be done for it.

He simply shakes his head at the boy's remark. To some extent, he appreciates what Ciel is trying to do--give him some kind of hope for reconnecting with those people from his past--but there isn't much point dwelling on any of it.

"My hair and eye color aren't natural," he explains, "And my original name was lost in the encounter with the Tokoyami."

Simply put, there was just no information that could be used to connect him to his original identity; in those days, fingerprinting didn't exist, after all, nor were people aware of the unique DNA of every creature.

"There's no way to tell which direction I could've come from in the forest, either."

It's such a large forest, and there were many, many routes within it. Many ways to get lost, too.