will I still be able to get more treasure throve keys in Lacuna region?

[Algester]

I have 100% all of the previous maps and I hope I can get a few more keys as I explore Lacuma right now I'm still trying to get into the castle and the research lab

[Algester]

ok nevermind Lacuna doesn have keys F

with a help of a map apparently I missed the keys from the Geni and Alber settlements in Auruma and Ligneus regions

[larcek]

you can find some maps online. the typical place for atelier guides is:
https://barrelwisdom.com/yumia

for maps i also found the posts by this user quite useful since there's even screenshots attached of the actual position:
https://www.reddit.com/user/EquinoxRaven/submitted/

there's no surplus on keys, you'll encounter the exact amount.

[Algester]

well scrounging the map for 50 chests is going to be mildly annoying especially considering I was missing 2 but it is safe to say that there are at least 1-2 keys per racial settlement in the 3 regions