Where in my post did you see a reference to a stolen device? You didn't. And, the first sentence in that post was a direct response to the poster, and neither you nor anyone else can vouch for where those phones that were auctioned off came from originally, now can you.
Apple is not and never will be in the business of invading people's privacy simply to fix a problem that you can avoid to begin with. It's really quite simple, and no matter how an Activation Locked device got into your hands, you always do the following to ensure it is not Activation Locked:
Make sure the device is showing the "Hello" screen. Select the first several options that are presented to you during the set up:
- select your language
- select your Region or Country
- select your Wifi network, or choose Use Cellular Connection
Only until you have gone to that point in the set up, you will not know if a device is Activation Locked or not.
Whether the Activation Lock Apple ID and Password are unknown for perfectly harmless reasons like my little brother changed it as a spoof, and now doesn't know what it is, to grandma is having a difficult time remembering how to get from her kitchen to her living room.... so: passcode? seriously?, to something as nefarious as you might want to imagine to anything in between, the resulting options do not change:
1. See if you can simply get your money back
2. See if the seller can provide the information you need (i.e., the Apple ID and password)
3. See if the seller can put you in touch with the person they got it from
4. If you have the original sales receipt, a photo ID, and the device, and you take it into an Apple Store, they may be able to remove the lock for you
So, again, how you got it is totally irrelevant. If you cannot follow any of the 4 steps listed above, then you are stuck with a device you cannot use. Chalk it up as experience, and next time, be sure to follow the instructions above so ensure that you do not encounter the Activation Screen as you are trying to set up.
Best of luck,
GB