Just looked up the drops for the Locked Adventurine Strongbox you get from Adventures

[Wolvinof]

All those drops in the Uncommon category, and nearly every time I keep getting Hyperqubes, Eggnoggin or Grumpy Snow Fiendling.

[PichuYang]

If tradeable and non-tradeable class costumes are so easy to get, those boxes and tradeable costumes would be dirt cheap... ...

There are also seasonal Pinata ally, which as the name imply, exclusive to season. Just wait the Hub got some nice look and try open for those.

[Wolvinof]

Originally posted by CatChu:

If tradeable and non-tradeable class costumes are so easy to get, those boxes and tradeable costumes would be dirt cheap... ...

There are also seasonal Pinata ally, which as the name imply, exclusive to season. Just wait the Hub got some nice look and try open for those.

Yeah, but the costumes being rare is understandable. I mean that there's all the other stuff like the Cookiephants in the same rarity bracket as the three I mentioned, but it's mostly those three I keep getting.
The reason I looked it up was actually to see if it was because I'd gotten all the drops already. But nope, turns out I've only got only a portion of them and it's just those ones are dropping a lot more than everything else.

[PichuYang]

I think I answered very similar question in Global chat recently. Are you referring to "Adventure" allies?

1) Make sure you check with your Club Merchant Prince.
2) Donation station appeared in non-starter world Medieval Highlands has cheapest donation option, use it to get a rare chance on Pixel. Not sure about other kind of donation station.
3) Like I say, check Trove Hub about seasonal changes. Seasonal allies are seasonal exclusive.

If you have done with ally, there are only few reasons to farm Trovian Outposts for Locked Box:
1) Adventurines
2) Work on long term 15 000 fishing badge.
3) All class exclusive costumes, be it tradeable or non. Either sell or usetradeable it's up to you want wait the RNG or not.
4) Sell the box at at least 10 000 flux.

I hope these answer your question.