From the Environmental Protection Agency:

Advertising old electrical equipment on eBay that contained PCBs turned out to be a losing proposition for Railside LLC, a factory surplus liquidator, after the sale was discovered by the U.S. EPA and the company fined. The Caledonia, New York based company advertised an old capacitor for sale without having it properly marked or stored as required under the federal regulations governing toxic substances…

PCB-containing electrical equipment must be marked so that it is easily recognizable and not disposed of improperly…the Agency settled for a penalty of $250 and an enforceable agreement to properly dispose of the PCB-containing equipment. This disposal cost the seller $1,200…

Federal regulations require that transformers and capacitors containing three pounds or more of fluids containing PCBs be identified by specific PCB marks to be placed on the equipment by the owner or user if they contain 500 parts per million of PCBs.

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Relevant Nexreg Compliance Links: CPSC compliance, OSHA MSDS authoring, MSDS authoring