These tokens work much like the Timeless Cache

These tokens work much like the Timeless Cache, in that using one of the appropriate armor type will grant you a piece of gear that fits your current loot specialization.

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 However, unlike the Timeless Cache, these give you items for a specific slot. For example, you might find a token that’s specifically for cloth bracers, or for mail shoulders,

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or for a trinket, and so on. You’ll always know roughly what you’re getting when you use one of these tokens.
Perhaps more importantly, they’re also Bind on Account. Pick up a token you don’t need? Got an alt you’d like to gear up, but would rather go exploring on your main? No problem. Thanks to the wonders of modern mailbox technology, you’ll be able to whisk that token off to any other character on the same account and realm, who can then use it to generate their own piece of ilvl 496 gear.