Last month, I submitted a bug report to SE about how augmented Sinister Reign gear isn't deliverable on the same account.
Tonight, I received a /tell from [GM]Wyndallus asking for additional information, (just to list out specific items to fill out in his reply to the dev team). Here's a screenshot of part of the conversation as proof:
It feels pretty good to get a response from SE in general, without having to do something drastic, like drop a Beastmaster mythic. ^^;
If you've been holding on to capped Sinister Reign gear like I have, you'll get your inventory back soon! (without having to just toss them). Woo-hoo!
Thanks SE!