Analysts are largely unconvinced by allegations that Muddy Waters leveled at American Tower Corp (NYSE:AMT) in a report yesterday. The company’s track record of transparent management, the presence of major auditing firms, and sound financials have led many analysts to conclude that AMT is still a sound investment despite the Muddy Waters report. Muddy Waters Says $250 Million Unaccounted For Muddy Waters says that it has identified a discrepancy in the purchase of 666 Brazilian towers in 2011 and that $250 million out of $585 million remains unaccounted for and that the valuation was done by “a dodgy accounting firm.”…