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What are you actually Misleading them about?
Are you
pretending to be incapable of using email to contact them (a feasible lie given your clearly outdated style:), or are you lying about contacting with them Lizabeth's answers at all? This will influence the later fallout.
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What sort of information are you trying to get?
Are you wanting something less ephemeral than a disposable email address? They didn't hesitate and were prepared for this sort of thing, so they are somewhat 'professional' and would provide you with a —similarly untraceable— cell phone number (which could force them to meet you again later rather than expecting you to send them pictures via email or something). If you insist on a physical address, they will give you a dead-drop location or PO box (which you could stake out if you wanted to). You will have to work a lot harder to get them to give up their anonymity.
Whatever the above answers, bear in mind that
Mislead does not get you information, but it can Create an Opportunity —maybe for them to drop their guard and reveal something, or maybe for you to be able to followup with a
Persuade (for something reasonable)— or could Expose a Weakness or Flaw in their tradecraft from which you could learn something (Possibly via
Figure Someone Out, though it will be hard to get more from them than I have already revealed, given your (apparently open and honest approach) they have been surprisingly open in return, if light on details).