More than 200 kilograms of illegal firecrackers were seized on Thursday at Poipet’s international border checkpoint.
E Khim, deputy director of customs at the border, said officials were investigating who the illegal goods belonged to.
The firecrackers seized were a mix of fireworks and cherry bombs.
They were hidden with other products in a cart taken from Thailand’s Rong Klea market into Cambodia, but inspection by custom officials revealed the illegal items.
Mr Khim said border guards did not arrest the cart worker as he did not know the firecrackers were hidden with his merchandise.
A customs office report said there were five boxes containing 175 kilograms of cherry bombs and two boxes containing 56 kilograms of fireworks.
All the illegal items were handed over to the provincial military police for safekeeping.
In September, three men were killed and another three injured when a stash of cherry bombs exploded in a truck in Banteay Meanchey province.
In a separate case in Kandal province, two children were killed and two seriously injured while playing with cherry bombs.