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A green and yellow John Deere mower was stolen from a Hampden address about eight weeks ago, and had since been sold online.
Senior Constable Wayne Brew, of Hampden, said it was not known whether it was sold through a personal page or a group.
It was unlikely the buyer knew it was stolen, he said.
People needed to exercise caution when making deals on social media, particularly if goods were offered at a heavily discounted price.
"If a deal is too good to be true, it probably is."
Meanwhile, police were investigating an alleged burglary at a Monmouth St address in Hampden on Wednesday.
A person arrived home about 5.30pm to find the house had been entered. Items were piled on the floor; police believed someone had intended to take them.
A gun cabinet was pulled from a wall, and a Uniden two-way radio was stolen.
Snr Const Brew asked for anyone who saw a beige-coloured vehicle parked in Monmouth St about the time of the alleged burglary to contact him on 0211914806, or at firstname.lastname@example.org.