I think that those question mark icons is for people who have some of the event skins. I believe that u just have to buy 24 packs for heirloom no matter how much skins from this event u have. At least i'm sure that this is how it suppose to work. I just need someone who bought those 24 packs to tell me if it's not bugged.
@grapleinmyas Items that you own are indicated with a checkmark.
For example, here's a screenshot of what I see in the Survivors Retro Pack:
The question mark icons are extra items in the Raiders Retro Pack's loot pool, (which don't seem to count towards unlocking the Heirloom, and I personally don't think they should be in the pack's loot pool either).
If I had to guess, the extra items were accidentally added to the loot pool seeing as the pack limit is 24, just like the number of event items. If it was an accident, I would wait a while for it to be fixed before buying another pack.
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