New iphone, synced everything from old. Old photos not showing. Please help

Same as the title. Warranty was running out, decided to exchange iphone 5 for another one. I synced everything with iCloud before deleting the whole phone data with the iphone rep. The new device retrieved everything except some 300 pics/vids from my camera roll. I tried to sync device with a laptop (itunes), nothing coming up. Will I ever get to see my old photos? Help is greatly appreaciated.