It will probably show up as "classified content" or "requires the Taken King"... My Pre-order stuff showed up on my Xbone a few days before I could install TTK in my 360... my Shader and Emblem just weren't there... it auto-equipped a common Emblem and a default no-shader.
I've had similar issues with crap like the GameStop Sparrow and the Limited Edition Items (Frontier Shell and the Ship).
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That's what's happening to me right now! My taken king stuff works great, but my expansion 1&2 stuff say, "requires purchase" and the missons are locked out. weird, huh?
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If you're on the 360 or the One... Try downloading the previous DLC again. No problems on the One, but I had to reinstall compatibility patches 5 and up (again) to play on my 360.