Remove the PCB and examine the date codes on the chips. Then compare these dates against the label.
For example, see this board:
http://ep.yimg.com/ca/I/yhst-14437584971410_2269_336392
Notice the “3709” on the PCB below pin #1 of the Samsung SDRAM. That’s telling you that the PCB was manufactured during the 37th week of 2009.
Now look at the markings on each of the chips:
Samsung SDRAM at location U2 - “940”
Marvell 88i9045 MCU at U5 - “0942”
SMOOTH chip at U1 - “0943”
Winbond “BIOS” IC at U12 - “0938”
The chip markings are date codes in YWW or YYWW (Year / Week) format. For example, the SMOOTH chip was manufactured during the 43rd week of 2009.
