The FBI and Portland police on Tuesday announced a reward of up to $20,000 for information leading to the recovery of two paintings by N.C. Wyeth stolen from Portland developer and art collector Joseph Soley in May 2013.

Police Chief Michael Sauschuck traveled to the Boston FBI office to join Vincent B. Lisi, special agent in charge of the FBI’s Boston division, to make the announcement. It comes a month after a New Hampshire man was convicted of illegally transporting four other N.C. Wyeth paintings stolen from Soley at the same time. Two other men have been convicted of possessing those stolen works.