On 8/23/07 @ 3:40PM EE alleges that an injury occurred Monday 8/20/07 but did not report it to his supervisor. He states that he smashed his hand with a crib block but didn't think he was hurt until after work. He said that his hand started to swell and he went to Logan Regional ER about 6 o'clock & was seen about 8 or 9 o'clock. I contacted his work site & there were no witness.