In this photo taken Aug. 19, 2015, the Internal Revenue Service Building in Washington. The IRS says it is once again using private debt collectors to go after tax delinquents. The resumption of the program comes amid a wave of telephone scams in which fake IRS agents try to con innocent taxpayers out of their money. (AP Photo/Andrew Harnik) A Collier County postal worker lost hundreds to someone claiming they were an IRS agent. Experts say this type of scam increases over the holidays and people should know what to look out for.