Rajesh and Amit, residents of Jaipur, were detained after they failed to give any satisfactory answer about the money.
"We have seized the money from the duo as they could not give any substantial answer and forwarded the matter to Income Tax Department for further probe," SP (Crime Branch) Vikas Pathak told PTI.
Pathak said the duo has claimed that its their money and were not going to exchange with the demonitised currency.
"We are verfying their facts and further investigation is on," he added.