Can you weigh Pop Series Booster Pack?

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All pop series packs only have non-holo cards

POP Series 8 'Cracked Ice' Reverse Holos

Hello everyone, Wanted to run a question by the group. Currently on Bulbapedia there are four ‘additional’ cards to the POP Series 8 set whose origins are ‘unknown’ 6/17 Cherrim Cracked Ice Reverse Holo 7/17 Carnivine Cracked Ice Reverse Holo 8/17 Luxio Cracked Ice Reverse Holo 13/17 Croagunk Cracked Ice Reverse Holo Is it truly a mystery? I feel like someone would know. Thanks!