There are many items I don't know about... these are very obscure...
Sometimes they are personald devices, sometimes reward packs.
Maybe it's possible to stuff these in more tabs... like "rare items" or "special items"... or whatever... don't know yet, but please discuss what more tabs you would like to see on exchange.
I also think there are way too many duty officer tabs... this should be reduce to just one duty officer tab... and instead have a new search box option which mentions which duty officer you would like to see.
This at least cleans up the tabs a bit... in return for more time required to search for duty officers but might be worth it on the long run.