This issue is being dealt with on an individual basis, as players have missed out on very different items and amounts of items or other things.
Generally therefore the Customer Support is looking into what you should have received, and what you do have in your inventory for each report they receive.
If you have issues making yourself heard at the Customer Support, please stress in your report that this concerns an old issue from March BEFORE the fix was implemented, and try to narrow down the time frame that you lost things in, and specify what you have lost.
A lot of the lost items can be verified in these cases, and the support agents are instructed to re-send these. I have seen issues with the communication however, when it wasn't clear when exactly and what was lost, and support had no indication on what to verify. There are also items that can not be re-sent for technical reasons, for example skilled points that were reverted (gold was credited back already when that happened).
We are working on improving the training for Customer Support to ensure all our agents are knowledgeable about past issues like these as well when they receive your reports.