I can shed some light on these issues:
Zephyrite Weapons: These 3 (+3) weapons don’t exist yet, but they’re in the pipeline. They were unfortunately pushed out last year in the lead up to End of Dragons, and we weren’t able to get them done in time for this year’s festival. While it's hard to make guarantees this far out, I expect them to be in for next year’s festival.
Weapon Boxes: This is a fair complaint – we weren’t able to adjust them for this year’s Four Winds, but expect to see a single-box version in this year's Halloween (more weapons for Halloween confirmed?). For what it's worth, the two boxes in Four Winds aren't strictly sharing drop chance, so it's more like you're getting extra weapon boxes compared to last year - but that's invisible drop-table-math and it's not fun to get the old box when you hoped for the new one.