Lego figures worth a total of £60,000 were stolen from a truck that had parked in Morley.
The theft took place on Howley Park Road East, at the junction with Britannia Road, on Friday April 4 at around 11.25pm.
A Renault truck was attacked by the thieves who cut the curtain sides to get inside before making off with the high value items of Lego.
At the time of the theft, a white Mercedes Sprinter van was seen in the area with four males all wearing hooded tops.
Police say all the items that were stolen from the truck were all Star Wars Planet Figures.
Anyone who has any information about the theft, has been offered any of these products of knows of anyone attempting to sell them, is asked to call Morley Police Station on 0113 2382034 and ask to speak with PC 595 Evetts.