If change HS CODE Shackle 731829 your company can send the original to me before Jan. 15, 2020.Our company clear the customs without form JV first.Later, Please send the original to us within 15~20s day form date of B/L (Because we have to provide original C/O to customs within 30 days from date of customs declaration).So I think your company have a buffer period for at least 15 days.Thank you