I am in the UK and have my binder, but then again I didn't use the dealer you mention. I think you may need to consider that the problem may be with this dealer rather than a delay with Artbox.
I have sent an email to Cards Inc yesterday and got a reply back saying:
The delay is down to Artbox, our buyer has been trying to contact Artbox
but has had no joy. We may not even be able to get our order, if this
happens we will inform all of our customers via a letter.
If you have any further questions please do not hesitate to ask.
So has you could imagine I am very annoyed about this

and perhaps let my buyers down whoa re waiting for them to arrive.