Some labourers engaged in cleaning the septic tank, found the bullets inside a container and informed police about it after which they were seized.
"The bullets belong to British era as 'Made in London' and Made in Winster' are engraved on the bullets," said Prabhat Prabhat Kumar Pradhan, Additional SP of Jeypore.
Police suspect that these ammunition might be from the huge cache of bullets stolen from Jeypore Palace about 30 years ago.
The septic tank belongs to the District Industries Centre (DIC) office at Jeypore.