A PTIN is an registration number issued by the IRS to paid tax preparers. You are not required to have one. You do not need a CAF number, either.
The better practice in this situation is to mail the return and other documents to the IRS. Please send the documents by certified mail or a private delivery service (FedEx, for example) so that you have proof of mailing.
You should also consider filing Form 56 (attached) with the IRS.
