Can we really think about adding a chest to the end of any new raid or quest with all the items in it? That way you could simply delete it when the patch goes live. Here is why=
1. Few new raid items get discovered
2. Items that arent discovered (or epiced)= do not get tested
3. Items not tested= possible bugs go live
4. Bugs that go live= angry community (takes to long to fix these bugs)
Players can not test what they dont have access to, and as you can see from every test patch more then 80% of new raid/epic items never get made and tested. If you want these items tested as well as the quests they drop in then add an extra chest at the end of the quest with a bunch of them. Epic modes should have an end chest with scrolls/shards/seals as well as a unlimited amount of epic tokens.
This way every new item will be tested fully by the community (instead of leaving 100% of testing to the 1 person who got the item which is unreliable) and bugs can be found early and corrected. Would also encourage more use of the test realm!