Criminal investigation agents with the Internal Revenue Service were seen going in and out of a house on Main Street last week in Rangely. A spokesman said he couldn’t comment on the investigation, other than to say the agents were “there on official business.”RANGELY I Sharon Briggs didn’t know who was pounding on her door the morning of Jan. 14. “I had no idea whatsoever,” said Briggs, whose house at 832 E. Main St.…