They might actually sound good- depending on how well the seller integrated them (crossover mods)... but they're definitely not AR3s anymore.
In defense of the seller- those aren't cheap components. That B52 woofer looks to be a rather heavy-duty Eminence-built driver (and probably cost like $80 or more each, new), and a Dynaudio midrange dome definitely AIN'T CHEAP either (just those, in good shape, could bring close to $100 each, to the right buyer, these days). Those Philips AD0160s are getting harder to find, and probably are $30 or more each, realistically, these days...
He's not going to get $399 for them, I would strongly predict... but it's a lot better than the "white van speaker components" you see stuffed into these many times...
Regards,
Gordon.