As most people know, an original Intel boxed processor not only comes with an original cooler, it also has 3 years of warranty backing it up. Meanwhile, the cheaper bare tray processor is only covered with a 1 year warranty.
The price difference between the boxed processor and the tray processor is quite significant. For a Core 2 Quad processor, the price difference is about US$15... To get an even better price from Intel, many OEMs and system assemblers order tray processors in bulk. They do not make use of all of these processors so a large number find their way into the DIY markets. However, that is not the problem.
Unfortunately, some greedy retailers are repackaging and selling tray processors as the more expensive boxed retail processors. It has been reported that each set of fake packaging only costs US$0.43 while the cooler costs less than US$1.50. In total, it only costs these people less than US$2 to repackage the processors. This gives them an additional profit margin of US$13 per processor.
:no:
Also given are the ways to identify fake boxed CPUs
Tech ARP - Counterfeit Intel Boxed Processors Rev. 2.0