Do not ever place a sticker or any other material on top of the processor Integrated Heat Spreader (IHS) for tracking purposes. Only Thermal Interface Material (TIM) should be applied between the processor IHS and the fan-heatsink. Using any other material will degrade the thermal transfer between the processor, the IHS, and the fan-heatsink. This could potentially damage the processor and void your warranty. See below for an example of what not to do.
The best way to identify and track a processor sold through your place of business is by documenting the Unique Unit Identifier (ATPO/SN) on the invoice. An example is pictured below that illustrates where this can be found on an Intel® Core™2 Duo processor E6700 and other desktop processors.
Consult the appropriate processor Specification Update for where the ATPO/SN is located if you are encountering trouble finding it. This information may be found under the technical documents tab on the applicable Intel® desktop processor family support site.
This applies to: