hello everybody!

I have some questions and I really don't know who to ask about it
I've pre-ordered RNR Circus at YesAsia, the day, or the day after it became available for pre-ordering. I have also ordered some other album, so my order details had only two items.
Later (2 weeks after pre-ordering it) when I checked my status order it also showed me a third item ( RNR Circus B3 poster). I was really happy of course.
The bigger surprise was today, when i checked out my order and... the B3 poster has changed in a B2 poster (Type A) and it also appeared a fourth item of the order... "Hamasaki Ayumi A Complete -All Singles- Special Gift".
I really am excited! What's all about this A Complete special gift? What's the link with RNR Circus release? And... what's the difference between an B3 and B2 poster? (in my country we only use A1, A2...A4... sizes

Thank you!^^