1. He look for unbroken spirit, intelligence, and ones that are either fresh(Just caught), or haven't been a slave long. The auction, since it's a high class one, would most likely have unspoiled, visually appealing slaves, no the drudgery or hard labor type slaves, and children. Children are at the top of the list for Alexi, wanting to get them young before being totally down trodden, however if it already looks like the youth's spirit is crushed, Alexi normally just reminds himself that they will all be free one day.

2. And e-card would be basically a signed permission slip from Alexi, allowing Joseph to act on his behalf, only ever given to slaves like Joseph who have either been hard broken, or serving so long that they no longer are at any great risk of rebellion. It would go into a wristband that would identify him as Alexi's slave and not only act as a promise that Joseph will behave, but also alert Alexi if anyone tries to lay hand on Joseph to either try and hurt him, or re-sell him. Joseph would just have to call for help and Alexi, along with the guard who scanned him in, would be alerted. It will also activate if Joseph falls unconscious, or doesn't return at his scheduled time, tracking him so the security people can find him. It's not fool proof, but it works fine for the high class auctions and exhibitions. Slaves are only in real trouble when sent out to the more skeevy sellers.

3. Why thank you *Bows*