Those ynips are everything.
I see your adult ynip doesnt have a very visible ring anymore on its carapace. Is it bcos it's already very big and mate often?
The ones here we have are still having a very obvious ring on its carapace.
Yours look like the ones in the wild.
But they are engraved these days (the WC)
If they are offered to me , engraved or not I will take if I have the fund and price is reasonable !!