Bedfordshire Police published the appeal on social media, asking the public if anyone's seen "16-year-old Riley from Stotfold."
The appeal said: "He was last seen on Monday (23 January) and is described as being slim, 5'7" with cropped brown hair.
"If you have info, please report via our website https://orlo.uk/7GJ1K, our live webchat services or by calling 101."
West Mercia Police then added additional information saying that he might be in Telford.
They said in a social media appeal: "Can you help our colleagues in Bedfordshire Police find missing teenager Riley?
"He is believed to be in Telford or Hertfordshire".