re: good faith
That's, IMO, only sensible. But the problem is (as I complained about in my previous posts), the police have little to no interest in doing anything more than "solving the crime". Since you're not the person who made the initial call, as a buyer you're just collateral damage.
Real world example? I used to work at a small computer store as a technician. (There were only 3 of us running the store; the owner, his good friend and me.)
Not long after the Christmas holiday, a man came in with what looked like an opened but essentially brand new Toshiba laptop and wanted to sell it to us. The owner asked him why he was selling it and he explained that he received it as a gift, didn't have the store receipt to return it, and really needed the money more than another computer. To make sure everything was on the up and up, the store owner asked him for his drivers license and photocopied it, and then agreed to buy the machine from him. (I forget the price now, but I want to say it was several hundred bucks below its retail price. Fair enough, considering we'd have it taking up valuable shelf space and had no idea how long it would be to find a buyer for it.)
The next week, the local sheriff showed up at the door, looking for the machine and immediately seized it upon seeing it on the shelf. Apparently, the seller was actually a guy recently out of prison who took a job someplace where he had access to see people's credit reports. He'd then apply for lines of credit under other people's identities and buy goods to resell for quick cash.
I can't imagine how our store didn't buy that laptop "in good faith", yet nobody cared. The owner was out the money he paid for it and the police simply thanked him for photocopying the guy's license, saying we were the first ones to think to do that, and left.
Like someone else commented, I guess you could get a lawyer and fight a situation like this? But it would surely cost you more than what you lost on the merchandise in the first place. (Even if you won, the lawyer would expect payment and a judgement against the thief for your legal fees is pretty likely not to ever get repaid.)
I haven't seen anything about "good faith". From what I've learned, you can keep stolen goods that you buy so long as you bought them in "good faith".
If this truly was a maxed out 15" rMBP ($3,449 retail + tax by my count), then OP did not buy this in good faith for only $2,000. Something is obviously up with it with such a heavy discount.
Even if it was only the $2,800 version rMBP that OP bought for $2,000, that seems like a transaction not in "good faith" to me. Especially when sales tax is factored in (if applicable).
Other things can definitely play into good faith, such as what happened during the negotiations, did the seller act/claim to be the original owner, would a reasonable person believe the seller's claims?
Just my two cents.