You can always send ur document through USPS(priority mail international). It will cost you 20 something dollars. U can include ur home phone numer in the address. It will reach Sundhara with in week - two week max. Once it reached, the officers from sundhara will call to your home phone  about the documents and your parents can collect the documents from the sundhara office.

I have sent documents through USPS to Nepal quite a few number of times. Until now I never had problem.