Did White House officials steal a file on John Roberts’ affirmative action record from the National Archives last year? “This investigation is unresolved and the file is still missing,” says a new report by the Archives Inspector General, which Tim Noah dissects over at Slate. (Hmmm…was it reclassified, perhaps?) Still, according to the report, a White House staffer was the last person known to have the file, and “[t]he report’s findings contradicted the assertions of Archives officials, who said last August that an attendant had been in the room at all times and that the lawyers had been separated from their bags.” The mystery deepens…