Upon login my equip [armory]Rival Titan Shell[/armory], the Guardian Games Ghost shell, was removed from my character, pulling any Rival shell from Collections deletes the shell upon leaving the character screen.
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I also had the same problem, only mine was the [armory]Rival Hunter Shell[/armory]. This was my only masterworked shell, so if I can't get the shell back at least I'd like my masterwork items back.