well my xp2800 barton is here and looks like i have a hot one...i hope.
i ordered a retail cpu for a change thinking that first batch of cpu chips would go to the oems and the later batches would get marked for retail as soon as the release date was near.and i might have called it right.
my chip

AXDA2800DKV4D
9411446260091
AQUCA 0304RPAW

that gives it a week of 4 ..last week of jan 03 .so this chip is just 3 weeks old.

here is a pic.