I bet CPU is fine but underhanded way to offload to new buyer. I guess you could test it, and ya up to you if you are okay with condition to keep or send back.
I'm not sure I understand your reply to my comment, I never said the CPU is broken, but I commented on the picture from the Ebay Listing.
I wrote in one of my previous posts, that the CPU should be fine, even if it has been delidded.
It has been delidded, a procedure where you remove the heatspreader (the top part), to be able to apply better thermal paste or liquid metal between the CPU and the heatspreader in order to improve cooling effciency - very often for better overclocking capabilities.
A delidded CPU should still be working, but in my opinion the seller should mention in his or her listing, that the CPU has been delidded.
For some, it would even make the CPU more attractive that it has been delidded, then you don't have to mess with it yourself, if you were planning on overclocking it.
I'm sorry if I'm misinterpreting your comment, english isn't my first laguage, and sometimes I reead it in the wrong way.
EDIT :
I still think, however, that it is unethical to try an sell a CPU as being completely fine, although in used condition, without mentioning that is has in fact been delidded.
Even the picture for the listing, the picture I commented on, the delidded CPU is positioned below a completely stock looking CPU.
I don't find that very honest, no matter how well the CPU is working.
Personally I would probably keep it, although I would consider the fact, that when a CPU is delidded to reduce thermals, it often means it has also been run at fairly high voltages