Means that the old lady refused to accept their bribe to talk on camera, so they're looking all over Austin to try to find some wino living under a bridge who will corroborate their fake documents.
I think the big thing is that she said Staudt had no influence over the TANG unit after his retirement.
The entire CBS argument needed Staudt, and Staudt was retired by 1973, if she could corroborate that, then the memo could still be fake, but the sentiments expressed could still be true, but without it the entire thing falls apart.