Riiiight. Because it's totally normal for someone to spend $500 + tax on an iPad Air 2 with gift cards and then turn around and sell it for $250 moments later. Riiiiight.
I retract my 99.9% statement, in this particular case: it's 99.99% certainly "stolen." The rest of the time an iPad Air 2 brand new sold for $250 is 99% likely to be stolen. The other 1% will be those giveaways etc.
Expecting that repeating a lie will make it true puts you in a very exclusive group.