Reg. B requires no notices until there has been an "application"...defined as: "an oral or written request for an extension of credit that is made in accordance with procedures used by a creditor for the type of credit requested."
Surely your procedures for paper applications don't call it an "application" when a customer takes a blank form home to fill out. It only becomes an "application" when the applicant signs it and mails or hand delivers it to your bank. Likewise, your procedures for online forms don't call an e-form an "application" until the applicant clicks the button or link that submits the content of the form for consideration and a credit decision.
If the consumer has not submitted anything, then you don't have an application. Scraps of information you might have pending in a data system don't mean anything unless the consumer submits them for consideration.
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...gone fishing.