I just searched all my 2000 pennies. i did not find and WAM's unfortunately. Most (nearly 90+%) were 2000d pennies - which I do not believe had WAM. From what I understand they were mostly 2000p (no mint mark) or maybe some really rare 2000s. I did however find some "wooden looking" pennies I thought I'd share. I'm not sure what causes this or if they are collectible though - here are some samples:
AH - DARN! - I just realized to threw them into the "take back to the bank" can... let me know if I should dig them out??
Blisters are common and bring little to no premium but if you are s collector of sorts those were really nice and worth keeping.