There is a N/M white label RL Zep II promo on ebay for the bargain price of $2800, in case you've got a stack of cash you keep tripping over.
Nice score! I have the same one, the "Advance Promotion" below the Epic label is cool and I'm thinking rather unique as I've never seen it before on any other WLP
Some nice examples of white label promos that I have: Jackson Browne..."Saturate Before Using"--with a burlap textured cover and the jacket opening in the right side of the jacket, instead of like officially released album with the opening in the top: Laura Nyro "Nested"...white label promo Flying Burrito Brothers "Gilded Palace Of Sin" white label And my treasure...a Canadian uniquely silkscreened odd promo Elektra label with a black "E", with the "Love" logo under the "E" not in Love's signature logo style. All 1966 Elektra labels had the "E" in white on gold, and the distinctive Love logo in black...see below. Love, Da Capo The normal label: