Hey gang - I updated my bug report over here Warbank is eating items - #12 by Agrias-bloodsail-buccaneers with a little video on how this happens. I can assure you the items are gone gone too - I just checked on my main rogue and 
https://youtu.be/ry7WSrbrvD4
Careful with the war bank. It’s got some issues and will eat some items.