From where did you get this conclusion? From what I understand, police already have enough proof of their transaction via Coins.ph. They don't have to recover the funds to prove that the couples are guilty.
I'm a law student and as per our constitution, this kind of scam related to digital stuffs is not yet covered. Bitcoin is not yet regulated by our government nor taxable. If found guilty, they will just be punished for a minor offense no matter how huge the amount was been amassed. In fact, pyramiding scam is bailable, being outside of jail gives you the opportunity to prepare your defenses. Also, there's a theory that before the arrest, they were already been protected by the police and backed up by local politicians from where they reside. That's the reason why all of the suspect accounts were already been cleared and all of its assets are legally owned and documented.