Generally you do not need to print and mail in any signature forms to any state if your state return has been e--filed and accepted. For PA, you only need to print and mail in form PA- 8453 IF you chose not to use a PIN on your federal return or you did not e-file a federal return. You can get this form here: https://www.revenue.pa.gov/FormsandPublications/FormsforIndividuals/PIT/Documents/2017/2017_pa-8453....
For Delaware you can get the form here: https://revenuefiles.delaware.gov/docs/TY17_de8453e.pdf
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