Brand new Motion air cleaners in box

[72MotionVega]

I have question... I ran into someone that has 30 brand new motion air cleaners in box he says.. here are pics below of the air cleaners.. I would like to buy these but I wanted to know ...are they the real deal?? what are they worth? what should I pay for each and even stupider question.. as I am not familier with these that much.. how do they attach to the carb.. ( I have a Holley 650 for example) what holds them on and how do you change the filter foam inside of it?? I appreciate all answers..

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