Here's my code from my 2500+ non-mobile:
AXDA2500DKV4D
PQZEA 0332 MPMW
1999 AMD
The code will be shown on the top of CPU with a black sticker and white letters. The 0332 in bold means it was produced during Week 32 of the Year 03 (2003). If your chip was produced after weeks 32-39 of last year, then it's locked. For those chips between weeks 32-39, you'll just have to test it to see if it's locked or not.
The PQZEA is the stepping of the chip. Some steppings overclock better than others.