Ok. An update to my previous post.
I dumped the sessions out on the cart page so that I could go to PayPal, click "Cancel and Return" and look at the sessions set by the checkout.
It looks like a session called [WASF_CheckoutWizard_NewFromBlank_Default] is the name holding all of the checkout values.
This same session is referenced on the eCart1_PHP.php for the sales tax rule only. Then again on the pp_confirm.php page for the $PPVal. and that's it.
I know that one of the WA page persist.php appends the WASF_ to the session.
Should all the references have the "WASF_" in them? Such as...
Are those correct w/o the "WASF_"?
Should I be binding to the $_SESSION['WASF_CheckoutWizard_NewFromBlank_Default']['Phone_Number'] in the insert instead. (And for all other values?).