It is suspected that Kalra has left Delhi along with his family.
"A lookout notice has been issued against Kalra in connection with the alleged hoarding and black-marketing of oxygen concentrators," a senior police officer said.
The police had earlier said that teams had been formed and raids were being conducted in the Delhi-NCR and neighbouring states.
On Friday, 105 oxygen concentrators were recovered from two upscale restaurants in south Delhi's Khan Market area. The restaurants are owned by Kalra.
On Saturday, the police transferred the case to the Crime Branch.
On Thursday, 419 oxygen concentrators were recovered from another restaurant owned by Kalra and a farmhouse in south Delhi. Four men were arrested during the raids.