Since you re-enlisted, you should have been provided a copy of your DD214 at that time. So long as you received the original DD214, you do not need page 4, everything is on page 1.
These days, all DD214s (plus all other personnel related forms) are computerized. This means no multi-part parts as when I started in the military. When you complete your current enlistment, you will receive another DD214 showing the Reserve and active duty time accumulated.
HQ Army, Reserve Affairs will most likely have a copy of your DD214 in their computer system. There is no page 4 (Member 4) anymore.
Throughout my 27 year career which included some Active Reserve time, I have never received a Member 4 form, only Member 1. I have DD214s from my enlisted days and several from my officer days (OCS completion, when I was Augmented as a regular officer (no longer applicable for current serving officers), and when I retired - all Member 1 forms.
Bottomline. Don't worry about it so long as you have your original. Keep it in a safe place just in case you need it to validate your service especially for possible VA disability claim.
Lieutenant Colonel, U S Marine Corps-Retired