The 4867 number is the number of clans that enlisted. The calculation for placement doesn't use that number. Instead, they use the number of clans that actually participated. We don't know what that number is, but we do know it is less than 4867. Thus, it may have looked like you got Gold, but inactuality you did in fact get silver. There is no way to verify exactly what placement you got since they do not provide the number of clans that participated.