Tuesday afternoon, Artnet’s “Urban Scrawl: Graffiti and Street Art” week-long online auction ended, having attracted twice the traffic of its predecessors. Among the hot-ticket items and highlights: the staple bunch of Banksys and Harings, FUTURA’s Untitled for $17,250, Jean-Michel Basquiat’s Cabeza for $19,550 and COPE2’s recently “appropriated” subway sign Church Av Station to Flatbush Av only (2010) sold for $2,530.