The highest known value I could find was $29,325. This was in extremely fine condition. It had very sharp, clear die marks believed to be the result of being one of the first strikings from the Snow 5 dies.
I have read that the value today of an 1856 flying eagle cent is $6500. And if it is in certified MS66 condition the value is $175,000. Many use 1858 coins as a counterfeit.