Crack them out! For charity 
I agree with the posts the suggest opening 1 heavy.
Inside a fitted graded card sleeve with one card saver for storage. If I take it out of storage or ship it I’ll add a card saver so as to sandwich the pack.
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I know but if it is a Holo pack then I just opened a 25-30k lol. That’s why I thought 20k with a 10k refund would make sense.
you’re relying on someone’s integrity a lot here
IMO for someone in your position, the only way to sell these is all at the same time, individually listed, with advertised weights and no guarantees.
I would open a heavier one. Regardless, if it is a holo, you’ve more than likely made your money back by what’s inside depending on when you purchased the packs. Either way, it’s a mint holo worth some good money. The only issue is 100% guaranteeing they’re from the same box. Looks likely but still a chance it couldn’t be so obviously not a guarantee holo in the heavier ones when/if you sell. Goodluck!