Police are trying to trace two men claiming to be charity fundraisers on Donington on Bain.
Reports of the men collecting, possible for Cancer Research and Breast Cancer, were made to police on Tuesday.
Residents are asked to be vigilant and to not let anyone into your home without thoroughly checking and questioning their credentialsA Lincolnshire Police spokesman
But a Lincolnshire Police spokesman said: “We are unable to confirm the legitimacy of the two collectors as no charity has contacted us to say that collections were going ahead in the area and no one has been able to provide details of the charity.
“No specific charity was mentioned by the collectors but ‘Cancer Research’ and ‘Breast Cancer’ were words used in conversations by the two people involved.
“Residents are asked to be vigilant and to not let anyone into your home without thoroughly checking and questioning their credentials.”
There were reports of the same pair in South Cockerington on Wednesday and police are keen to speak to them in the event that they are genuine.
“Please be careful when donating to charities at the door as, quite often, they will ask to sign you up to a regular donation by standing order and for that they will ask for details of your bank account,” the spokesman said.
“If you do not want cold callers at your door, a sign or sticker on the door to that effect generally gives people the courage to deal with callers robustly by drawing their attention to the sign.
“The notice would state that you do not deal with strangers at the door and then close the door without engaging in conversation with the person.
“If you are not happy with any caller to your address, please contact Lincolnshire police without delay by calling 101.”