Nicollet County authorities investigating reports of mail theft The Nicollet County Sheriff’s Office announced Tuesday that it is investigating a string of thefts from mailboxes. (Source: WAFB) By KEYC Staff | February 2, 2021 at 4:20 PM CST - Updated February 2 at 4:20 PM NICOLLET COUNTY, Minn. (KEYC) — The Nicollet County Sheriff’s Office announced Tuesday that it is investigating a string of thefts from mailboxes. Authorities say individuals were seen Monday in a black sedan passenger vehicle taking mail from mailboxes. Several pieces of mail have been recovered belonging to residents in Nicollet, Sibley, McLeod and Steele counties. They add that it appears these subjects are targeting mail containing personal checks or cash.