^no need to worry. if they ask for additional identification, just present a driver's license, SSS, whatever ID. though hindi naman kami hiningan ng additional identification nun. passport lang. tsaka as long as may itinerary ka and hotel reservation, keri na yun. believe me. yan lang naman ang ginagawa namin when we travel abroad. like last time when we went to SG, tinanong ako kung saan kami mag-stay, tapos sinabi ko yung hotel name. and i was ready for the mismong reservation confirmation, pero di naman hiningi.
in summary, you don't have to worry kung wala ka namang ginagawang masama, useless worry, magkaka-wrinkles ka lang.

basta ensure you have a hotel booking confirmation and an itinerary.
nanonood ako ng Border Security sa Crime Investigation channel, yung mga hino-hold lang naman ng Immigration eh yung mga kaduda-duda, meron dun sabi niya tourist siya pero ni wala siyang masabing tutuluyan or gagawin sa Australia. eh syempre kung magbabakasyon ka dapat ni-research mo yung mga gusto mong puntahan di ba? kaya i'm advising na dapat may itinerary ka.