Tier 4 Visa
I, personally, would not want USPS to handle my passport...
It looks like here are your options:
http://www.vfsglobal.co.uk/usa/user_pay_services.htmlApplicants should be aware that they may experience delays if any of the following factors apply:
You do not include the Return UPS shipping label with the application and supporting documents.
It goes on...
We do not encourage you to purchase the UPS Courier service after you have submitted your application as it could take a minimum of 24 hours to locate your application and link your UPS Shipping Label.
I think they will be contacting you to give them a UPS account that they can bill... at least this is what has happened for people for settlement visas (not sent to NY). This may delay the return of your visa.
Looks like you were meant to purchase return of your visa before you sent the visa...
i.e. (from the same website quoted earlier):
Courier Service
Available in the US and Puerto Rico
Service type 1: Return Courier Service:
This service provides an option for the applicant to purchase a UPS Shipping Label online to include with their application to allow for the UKVI Decision Making Centre (DMC) to return the applicants documents to their preferred mailing address, following a decision on the application. Don’t forget to include a print-out of the UPS Shipping Label in your application packet that you are mailing to the DMC.
Service type 2: Round Trip Courier Service
This service provides an option for the applicant to purchase both the return shipping label, along with the shipping label for the applicant to send their visa application form and supporting documents to the UKVI Decision Making Centre. Don’t forget to include a print-out of the UPS Shipping Label in your application packet that you are mailing to the DMC.
Are you applying with your family or a group? If you are a Non-settlement applicant (whose documents must be sent to the UK DMC in New York), you can use only 1UPS Shipping Label for up to 4 applicants. You simply need to add the details of each additional applicant in your group when making the purchase in our Shopping Cart. Simply select “Save and Add Applicant”. Your shopping cart will be updated as per the pricing for a group of up to 4 applicants (see below). Unfortunately, Settlement applicants (whose documents must be sent to Sheffield UK) cannot apply as a part of a group and each individual applicant must purchase his own shipping label.