The WAA12 wad is a winchester wad for 1 1/8oz only ...but sometimes people will say its a "WAA12" when its really a clone ...and sometimes the clones don't use the same grade of plastic.
I'm not sure what his designation of "WTS" is ....but as long as they are 2 3/4" you should be fine.
But $ 0.08 each is way too much .... and I don't know what the FTF means either .... personally, I don't like WIN hulls in 12 or 20ga / I prefer Remington STS - (they are much stronger / last a lot longer ). The most I would pay for once fired, that never hit the ground ( I don't want mud and crap all over them ) - so they need to come out of an O/U not a pump or semi-auto ...or stuff he picked up on a range ( that might be once, or 14 times fired...) is $ 0.03 or maybe $ 0.04 each .
New wads are about $ 8 for a bag of 500 so they are only $ 0.016 each
so I'd offer him $ 0.05 each with the wad / maybe $ 0.06 cents ....if he said they were "really once fired" ...and not just picked up from a bunch of shooters off a sporting clays range or something ....
some of the promo WIN hulls / are even less durable than the AA's ...so it depends on what they really are. I wouldn't buy them from someone that didn't have them local / and you couldn't look at them ...there are lots of hulls around if you want to get into reloading...
my club sells certifiable once fired Rem STS hulls for $ 0.05 each ...all the time....and they're significantly better hulls ( I get 15+ reloads out of an STS hull ) ...and I see WIN AA hulls in 12 and 20ga cracking after 4 or 5 reloads sometimes. If they are WIN AA HS hulls - I wouldn't take them if they were free ...
The WIN AA HS hulls have a 2 piece system / and sometimes the lower inner portion migrates upward when the shell was fired ...and they are a pain in the butt, big time, to reload. I'm not up on the latest on WIN hulls / but I think in 12 and 20ga the AA HS hulls take the same wad as the old AA's / but in 28ga or .410 the AA HS hulls take a special HS wad ....
All of which makes reloading WIN hulls to much work / too much aggravation for most of us that reload thousands of these things in a year ....so everyone I know that reloads 12ga - went to Remington STS quite a few years ago ...