Nice, and looks like you have a couple more there as well 
When it comes to the prices, as always condition is a crucial element and in this case it looks like all of them are in a real good condition without any pricetags on them and even the thingy´s on the head of the cards for hanging them in the store displays haven´t been punched out so you might be pretty close getting a near perfect rating on those (of course in case the detailed pics need to show the same).
With that said there´s something strange going on in the MOC Battle Beasts scene lately with some insane prices as you already noticed yourself. It´s not clear what is causing this and there´s even thougths of them being scams but it looks like there´s some collectors out there willing to pay more than top dollar for them so for you it might definitely be a good time to list these in the hope you get the same fish to bite as he seems to be hunting for mint condition cards. Normally these go for around $75-$150 maybe a little more if they´re in real good condition but that´s sort of the normal price range you´ve to think about. The last period though you can say those prices have doubled or even tripled in some extreme cases (if these were indeed valid sales...).
Don´t want to go blind on those recent prices so I´d say if you stick within the $150-200 range each you should be pretty close to their current value which means the set of 12 Cards (holding all 24 different Series 2 Beasts) represents a value of around $1800-2400. And in case the recent prices are true it might be even double that...
When it comes to packaging its important to use enough bubble wrap obviously and to take care that the bubbles from the cards themselves don´t damage each other so you might stick with the idea of how they were distributed back in the days in which they all stand straight up in a box and with the bubble hitting the back of the card in front of it etc. But packing a set like this will for sure require some attention and the same goes for the shipping company to ship them with since any damage done is a loss.
Hope this helped a little, good luck.
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