Man what a fix.

If the basement is unfinished , then , what are you tearing out ?

What is the Sill plate (basement header) relationship to ground level ?

Is the home surrounded by concrete Slabs (Driveways and walkways) ?

Termites will randomly forage .

How far away is the infested neighbors house ?

Here is an easier way to look inside walls
Bora Scope
http://www.iaqcoop.com/Merchant2/mer...ategory_Code=B

drill small holes and peep inside. Spackle shut.