there are quite a number of white-ghost items in the RIG. White ghost is when the item is visible only if you put some other color behind the item, like a background--it's invisible in the standard forum white. I'm going to put the otherwise useful items from the RIG first, then all the white-ghosters.
Apotropic Magic (Evil Eye, Hand of Fatima, Angel Banishment, and Shimenawa) show from behind only: both sides on Hard Shell Pack and Dander/Coffin/Jack.
Chain Letter (You Got Mail!) partial behind, both sides on HSP, full front on Dander/Coffin/Jack.
Demonic Chair, both poses both sides for everyone.
Possessive Captain white ghost from behind; full front on Humanoids; white ghost both sides on HSP; wg front, full back on Dander/Coffin/Jack.
Project Fatal (Searching Hands) white ghost behind, both sides HSP, full front wg back Dander/Coffin/Jack; (Camera Frame) partial front, full behind; both sides full on HSP and Dander/Coffin/Jack.
Third Stall (It's Safe and She's Here) behind only on Emgnol/Wisp
And all of the following have the same properties, to wit: white ghost from bahind; both sides on HSP and D/C/J
Forbidden Hook (Honey Chest)
Huin Seulpeum title pose
Melodious Witchcraft title pose
Rusalki Maiden (Dress)
The White Lady (Veil, Draped Waist, Torn Sleeves)
Wedding de Mortis title pose
also, for more limited use:
Pet Cemetary (Undead Cat) white ghost front only HSP and D/C/J; (Undead Rabbit) front only Dander/Coffin/Jack only
Weeping Wanderer (Shawl) front only HSP and D/C/J.
Looks like most of the RIG stuff has been found; here are the things we can use:
Man-Eating Tree partial front on Emgnol/Wisp and (barren) behind only on Emgnol/Wisp, otherwise both sides of both poses work.
Megalodon Monster behind only on Emgnol/Wisp; (Deep Seas) white ghost behind only, both sides HSP and Dander/Coffin/Jack.
Mystic Locations all three both sides except behind only on Emgnol/Wisp
Sigbin front only but not on Emgnol/Wisp; (Clay Jars) behind only, only on HSP
Tropical Kodama (Bushes filled with Kodamas) behind only, both sides on HSP and D/C/J
And some white ghost items, all of which show white ghost behind, both sides on HSP, D/C/J:
Night of the Popobawa (Shoulder Wrap and Corset)
Skyfish Ribbons all three poses
Stygian Shuck (Black Mist Boots)
Peaceful Ruins is a really weird one.
The title pose is fairly normal, showing only partially from the front and completely from behind on Grunny-types; completely from both sides on Hard Shell Pack and Dander/Coffin/Jack.
But the two companions, (Dancing Cygnet of White/Black) show from the front only, but NOT on most Grunny-types. In fact, as far as i can tell, only Emgnol shows it--not even Wisp.
Capricious Mage (Staff) white ghost behind only; both sides on Hard Shell Pack and Dander/Coffin/Jack
Honorable Shaman (Companion) behind only on Humanoids and Dander/Coffin/Jack
Petulant Enchanter (Cerebrus) front only HSP and Dander/Coffin/Jack
Veracious Musketeer (Pointer) behind only HSP only
Zealous Engineer (Otter Pet) behind only HSP only