Eles terão que apresentar os documentos originais , de immihelp.com :
Sponsorship Documents
Applicants who do not have sufficient funds of their own to support themselves during their proposed stay in the United States must present credible evidence to show that they will be supported there by some interested person; such evidence should reflect the ties between applicant and sponsor which form the basis for the latter's assurances of extending support. You should present all original documents sent to you by your sponsor in the USA.