Where to get Ancient Boots

Does anyone know where to get these?
I'm trying to craft the mage/thief Bosshunter gear but all I'm missing now are the Ancient Boots.
To clarify, I'm talking about these, not the greaves.
The ITCG guide doesn't list them under any gachapon, so are they even obtainable at all?

 

I have no idea as well, but I got 2 of it. I gacha mainly at Shrine, CBD, NLC or Nautilus. I can donate them to you if you need it...cos I don't know what to do with them and I've no intention of making Bosshunter gears.

 

I just bought a pair!
The seller said he gacha'd a lot in elinia

 

Good to know...never knew anyone who would gacha there..

 

https://royals.ms/forum/threads/new-source-gachapon-guide.110983/
Naut and Ellinia

 

For eraser