If I still have the right of this, the packaging needs to ensure that each round is separate to the one next to it - rounds can't be touching. This means that some commercial "original unopened" packaging is not OK - Sako Gamehead 50-round bulk packs are one here but the same product in the 20-round boxes that have the plastic slip insert are fine I believe.
The plastic cases are OK as others have noted - if asked I would phrase my reply as "it is packaged in commercially produced plastic ammunition packaging as it is safer and more secure than the factory cardboard boxes...".
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