After the supervisor closed the hole, the noise never did start again. After about 4 days, the exterminator visited one last time to pick up the traps and close the case. EEK! He found a rat in one of the traps! After almost 2 months and 10 visits that included 3 whole-house searches...one rat!
A few days later, no new activity; and they did take the traps and close the case. The nights are quiet, except for my mind, which jumps and waits silently for more each time I hear the tiniest noise.
We'll never know what really happened in the attic and subfloor! Such are the mysteries of life.
Nevertheless, we are minus one pest. Downsized!