CHETEK, Wis. (WFRV) - Several fake $20 bills were turned in to a northwest Wisconsin Police Department on Tuesday morning, and more of them were found around a street in Chetek. The Chetek Police Department posted on Facebook a photo of the bills, which appear to be real, but are marked as "COPY MONEY." Chetek Police Department While there is no evidence or known cases of these bills being used at local businesses, authorities are urging caution for owners to pay attention to any forms of currency. Door County Sheriff’s Office urges safety in wake of scam calls seeking financial donations No more details were provided.