Bought an ipad air last week when i start to using it i realise my ipad air device name is demo's ipad with another person apple id, in the process of buying, they connect my ipad air to their demo mac book with cable but i forgot is they sync with the mac book or nt. But in between tht they help me to extend the warranty online. I bought from a mac city outlet. Any way to check my ipad air whether is an demo ipad or not?