Emailing HR for Interviewers emails for the thank you email?

Just got finished absolutely killing an interview. Best interview of my life by far. Great answers, Great Questions. Everything.

Except I forgot to ask for their business cards for a thank you email. Should I let it go or email the HR rep for their emails? It might be a dumb question but I worry that they might find it creepy that They never gave their email and I yet emailed them still.

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