Whenever Swiper manages to steal items from Dora and Boots, he exclaims "You'll never find it now!", but the stolen items are always found and retrieved within a few seconds.
Backpack: [singing]
Backpack, Backpack, Backpack, Backpack. I'm the Backpack loaded up with things and knick knacks too. Anything that you might need, I've got inside for you! Backpack, Backpack. Backpack, Backpack. YEAH!