Dog walkers and ramblers have been asked to keep an eye out for the missing £3m Henry Moore sculpture.
Henry Moore's Reclining Figure is considered a "national treasure"
Police fear the thieves may dump the statute due to publicity surrounding its theft from the Perry Green estate in Much Hadham, Herts, last Thursday.
A reward of £100,000 has been offered by the Henry Moore Foundation for its safe return.
The bronze Reclining Figure sculpture weighs more than two tons and is 11ft in length.
Hertfordshire Police are now questioning householders in Harlow, Essex, where the statue was last spotted on the back of a Mercedes lorry within an hour of the theft.
The Mercedes vehicle, which had been stolen from Royston before the theft, was located in Coopersale near Epping, Essex.
It is currently undergoing forensic examination.