HT2109: Transfer content from an iPhone, iPad, or iPod touch to a new deviceLearn about Transfer content from an iPhone, iPad, or iPod touch to a new device
Currently Being ModeratedJan 9, 2013 6:57 AM (in response to Hope102)
I may be mistaken, but I do not beleive books samples download to iTunes, nor do they get backed up to iCloud. Not 100% sure about that since I didn't use the back up when I set up my newer iPad or the iPhone. I know they do not show up in purchases.
My guess is you will need to re-download them.