Two Russian immigrants were busted by federal agents after customs officials discovered a cache of 3.25 million steroid pills in a cargo container that purportedly contained furniture.

Aron Kuperman, 42, of Brooklyn, and Ilya Tsoy, 19, of Staten Island were charged with conspiring to import steroids in what the feds called the largest steroid seizure in history.

The street value was estimated at $4 million to $5 million.

Customs agents discovered the shipment Jan. 6, when they were inspecting a cargo container that originated in Moldova in the former Soviet Union.

It had been shipped via Ukraine and Israel to Port Elizabeth, N.J., according to a complaint filed by Drug Enforcement Administration Special Agent Roby Kennedy.

The complaint said that 140 boxes of steroids were hidden in pallets inside the container.

As part of a high-tech sting operation, the agents replaced the steroids with other items and sprinkled the inside of the pallets with dust that becomes visible under ultraviolet light.

They also installed beeper devices that would emit an signal to agents when the pallets were opened, the complaint said.

Agents said they monitored the delivery of the container to Interstate Auto Sales in Staten Island and videotaped Kuperman as he supervised the removal of the pallets with a forklift.

After they watched Kuperman remove some boxes from the container and take them into a trailer on the car lot, the agents moved in and arrested him and Tsoy.

According to the complaint, Kuperman allowed the agents to search his apartment, where they found samples of steroids in the shipment.

Waiving his right to remain silent, Kuperman denied he knew steroids were in the container and "made various claims as to why the pallets allegedly containing furniture were in a car lot on Staten Island," the complaint said.

He also claimed he had stolen the pallets from their true owner.

Both men face five years behind bars if convicted.