Personally, I upgrade spare class items to max and store them in the vault to break down one day. It's not a full return of materials but it's better than losing them in the post master.
For enhancement prism you can convert into enhancement cores. If your season pass is leveled blue armor engrams will drop half upgraded at rank 5. Upgrade them to rank 8 then dismantle for a net gain in enhancement cores.
Those aren't fixing your problem but I hope it helps clear your post master.
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Didn’t know that trick about blues. Nice pro tip!