Do you know if your Christopher Wilber had two brothers named Isaac and David? I have a Christopher Wilber born about that time, from NY, who left NY between 1825-1835ish, and headed east. David and Isaac settled in Lawrence Co., IL, and Christopher supposedly stopped in Indiana, probably not far from Vigo Co., or perhaps even in Vigo County. Christopher is a mystery link in my ancestral research. This Christopher, if he is the brother of Isaac and David (above), would have been my 3rd great-granduncle, as Isaac was my 3rd great-grandfather.
Does this sound like your Christopher? If so, I'll be happy to share what info I have on the brothers, and if he is the same as mine, I have an almost-certain identification of who their Wilber grandfather is, but am not yet certain which of grandpa Wilber's sons is Isaac, David, and Christopher's father. It's something I'm working on as we speak, in fact, since I only got this clue a couple of days ago. But if it sounds like your Christopher and family, I'm happy to share what I have, and would love to know what you have.