Usual disclaimers about not being your lawyer, this not being legal advice, and your jurisdiction may differ.
The premise in your OP is wrong. Generally speaking, it is not the law that you are guilty of receiving even if you did not know the item was stolen. The prosecution has to establish that you knew it was stolen (or otherwise illegally obtained). Again in general terms, knowledge equates with belief in this area, so there is no room for epistemological quibbles about the nature of “knowledge”. The prosecution has to do more than merely point to grounds for suspicion, however. The grounds must be so compelling as to lead to the conclusion of belief on the part of the suspect.
In many countries (not sure about US) there is a rule of evidence called the “recent possession” rule, which means that if you are caught in possession of an item proved to have been stolen recently, and you don’t account for your possession of it, it is open for the jury to conclude that you either stole it or received it knowing it to have been stolen. This is really not much more than a rule relating to a particular piece of circumstantial evidence (being caught red-handed can be pretty good circumstantial evidence even outside of receiving cases).
Generally, the circumstances in which the suspect acquired the property are examined. As observed above, if you claim you bought a brand new big screen plasma at a pub from a guy who sold it to you from the back of his van in the carpark for $200 cash, no receipt, no warranty, and you can’t remember his name, then all your protestations of innocence and naivete aren’t likely to trouble a jury tasked with the question of determining whether you believed it was stolen.
And if you don’t explain how you got it, the recent possession rule kicks in. “Turning a blind eye” to information that would indicate the truth is also often compelling evidence that the suspect believed the item stolen as well.
On the other hand, if you bought the item in an eBay auction, (and can show the paper and electronic trail) then your claim that you did not know the item was stolen is likely to be accepted. Unless it is an original Matisse, the Crown jewels, etc.