I tried to identify what this is too... It's looks like a copy of a Cannondale Scalpel from 2000/01 but with full pivot instead of flexstays.
Also very similar shock / pivot design to the Outland VPP-3 XC..
It's not an Outland & from the pics it's not a VPP-design.
The toptube does suggest Schwinn or Santa Cruz, but also Daewoo, so who knows!..
I asked the seller if there was a serial No. to help maybe ID it, but got no response..
Its for the neighbours missus anyway - she liked the boingynessness of my Mt. Vision. Its got a decent air shock on it so it should build up nice with her Carrera donor.