Officers have had reports of the flyer pictured being posted through letterboxes in Dronfield Woodhouse.
A post on the Dronfield Police SNT Facebook page reads: "We have spoken to the Air Ambulance Charity and this leaflet is fake and has not been sent by them.
"They explained that they only leave correctly endorsed bags for items to be left for collection in with suitable contact details on them should you wish to contact the charity direct."
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