Rubuta ci gaba ga wannan sakin layi - Ƙa'idar ɓoyewa da kuma ɓoyewar kwanan wata yana nuna shakku game da amincin yawancin tushe na farko. Yawancin masana tarihi sun yi hasashen cewa John II na iya sanin wanzuwar Brazil da Arewacin Amurka tun farkon 1480, don haka ya bayyana muradinsa a cikin 1494 lokacin sanya hannu kan Yarjejeniyar Tordesillas don tura layin tasiri zuwa yamma. Masana tarihi da yawa sun yi zato cewa an ajiye ainihin takardun a cikin Laburaren Lisbon. Abin takaici, saboda gobarar da ta biyo bayan girgizar kasa ta 1755
, kusan duk bayanan laburaren an lalata su, amma an tura wani karin kwafi da ake da shi a Goa zuwa Lisbon Tower of Tombo a cikin shekaru 100 masu zuwa. Corpo Cronológico (Chronological Corpus), tarin rubuce-rubuce game da binciken Fotigal da abubuwan da aka gano a Afirka, Asiya da Latin Amurka, an rubuta su a cikin UNESCO's Memory of the World Register a cikin 2007 don girmama darajar tarihinta "don samun ilimin siyasa, diflomasiyya, soja, tattalin arziki da kuma tarihin addini na ƙasashe da yawa a lokacin binciken Fotigal".