Massimiliano, do you know if SS comes with a white bag?
IIRC Samurai Spirits had a very light blue baggie, while most of the kits released after had a darker blue one.
I have two kits, and one has it, the other I believe has been swapped.
I suggest to contact Stefano as I believe the pictures on the neostore are from his collection and he did deal with arcades/mvs since the beginning... he definitively can help.
Edit: Tomcat is another trustable source