Hullo!
On my hunt for future Chestnut Chums, I didn't find castaneus. However, I did catch a 10 queen colony! Have no idea what it is, well, I lied, yes I do, but the ID in the discord server wasn't very clear (if you're reading this I'm sorry but I'm telling the truth).
Some information:
They're very polygynous
They're a little polymorphic
They're a brown-reddish colour
The queen was just chilling there when I was moving them and I didn't even realise lmao