I'd say "it depends", as usual.
True Believers are sort of Emissaries of the White God, they can contact their "Boss" by praying, I would assume, but he is not really answering that way, or at all for that matter.
An emissary of a dragon would probably have a contact address or something like this.
If you want your guy to have an item that let's him send items to his boss right away, go for it. You could simply go with a "bag of holding" style item, that is really a portal to a part in the nevernever that his boss can access. I wouldn't even have him pay refresh, if it is only a one way thing, so he can't pull things out of it. It is just part of the deal with his boss.
Or give him a bag of pixie dust or something similar, and he has to draw a circle around the item with the dust for the item to be ported to his boss.
As long as he does not have any benefit for himself, I don't see the need to pay any refresh. The rest is just cosmetics.