Alright, here it is.
Link: https://invite.bublup.com/YMXaH3jEm8h_
I don't know if this is an invite link or if it is a clean direct link.

A clue about these samples is that it is possible to import them as raw data in Audacity but it sounds terrible. It's as if there are extra items such as headers and stuff that messes up the sound.
Another clue is that I could see some kind of header/file info if I opened them up with this link:
https://filext.com/file-extension/SD1
Just drop a file in there and it partially opens.

If anyone manages to crack this code please share the content with instructions about how to read this.