You know, the whole eBay & PayPal system TOGETHER is pretty darn safe.
I sold my original MBA a week before the revised model was announced. The buyer was a lady with NO FEEDBACK. I followed the PayPal seller guarantee exactly. I kept the receipt from USPS which showed insurance, delivery signature, and etc. This lady received it and left me positive feedback, too.
Well, a month later PayPal put a hold on the money. Apparently the buyer was a fraud and her bank didn't cover the funds... within 10 business days PayPal had covered it on my end with the eBay & PayPal seller guarantee. I had already withdrawn the money from PayPal into my checking account. So, PayPal put a negative balance on my PayPal account until their investigation completed in ten days. Had I not had the USPS information, I may had lost the case. But, this system is pretty safe as a seller as long as you follow the PayPal rules... which don't worry about buyer feedback...
As a buyer, you have an excellent guarantee on purchases like this. Here is another thing, USE A CREDIT CARD. Then, you have two methods of guarantee that your money is safe. If you do not get exactly the item described, PayPal will refund your money! And the proof is in the auction details. Many years ago I bought a Dell on eBay stated as "brand new" and it was an open box when I received it, otherwise was perfect... But, in the auction it said "sealed box." So, I didn't know if maybe something had happened to it and was repaired or whatever. The seller didn't want to accept the refund... So, I sent it to PayPal and they credited my account for the entire amount, shipping and handling and insurance all refunded as well. If PayPal ever fails you, the credit card is a big one... Credit Card companies guarantee your purchase as well. But, I would doubt seriously that PayPal would ever not side with you.
Now, if you deal eBay with NO PAYPAL, NO WAY! Or, if you deal via PayPal without eBay, NO WAY! Either way you can lose. So, with the pairing of eBay and PayPal you are like 100% safe... as long as it describes the item as BRAND NEW and SEALED BOX. Those two statements guarantee just that. PayPal and eBay require exact statements like those... A few years ago, eBay, for this very reason, stopped allowing people to use statements "like new or like brand new" and etc. It's either used or new. If used, you are taking more of a risk... than if it's BRAND NEW in SEALED BOX.
I would do it in a minute if I were you. As long as you buy on eBay, you buy from a user with many positive feedbacks, you buy from an eBay page describing the item as BRAND NEW and SEALED BOX... and you pay via PayPal ONLY! You are guaranteed to get what you paid for.
If it turns out to be stolen, guess what, GUARANTEE from PayPal!
You are covered every way. These sellers have many reasons for selling at discounts. And sometimes, their whole profit is shipping and handling and etc. The most you are ever going to lose is a short period of time of having the money held on your PayPal account.