Yossarian
Get thee behind me, Santa
I know, I read that. These are Taliban claims over years and would include stuff captured on the battlefield or overrun positions. So far I've seen no pictures of them driving around in American Tanks and Humvees. Of course it's possible that the odd one or two have escaped a grenade in the engine bay or the attention of US engineers, but I wouldn't reckon they've captured useable euipment in particularly significant amounts as a result of the current withdrawal.
This blog documents Afghan National Army equipment, most of it US-supplied, captured by the Taliban - there's a staggering amount of it.
Not sure if he knows how to fly that thing: