Hello,
This is a fine place for asking for help with bugs. However, in this case I can only recommend to you where to get assistance, as we do not handle issues of item retrieval on the forums. Please click the question mark on the upper right hand corner of your screen and create and submit a customer support ticket to the in-game CS team and they can assist you with this matter. Please make sure you have cleared out your backpack and mailbox before sending in your ticket, in case the missing fragments are in there.
Thanks and have a great day!