FBI Certificate - Return mail option querry

[Gogy]

I live in Pakistan and need to apply for FBI Clearance certificate from USA. I will send my application through a courier service like DHL, Fedex or TCS.

The application form has provided a Return Mail Option which as follows:

1. FedEx account number, or
2. Prepaid return envelop enclosed, or
3. First class Mail:

I called FedEx and inquired if they provide item # 1 & 2 facilities, but unfortunately they don’t in Pakistan.
Has any one got there FBI certificate while in Pakistan ? Would appreciate if they could share their experience?
Thanks,