Well, Glycine does have different packaging.
That I know for a fact as I've received the standard black leather box, but have seen the black with cream felt lining and also the wood.
I think some of the difference there is market, where they are being sold. I don't think they ship the wood boxes to much because of possibility of it breaking.
As far as the strap, I don't know. I have reviewed a $2800 Glycine Lagunare that came with a standard rubber and the small thumbnail buckle as you show.
I'm going to pm you an email address to contact someone at Glycine USA.
Maybe email them the pictures you posted and ask if they can help authenticate a little more.
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