The EEE parts supply chain is far-flung and chain of custody can vary wildly. Receiving counterfeit and/or tampered devices are real possibilities when procuring alternate-grad parts form the global supply chain. These products may not perform anything like the authentic ones, even though they may physically look identical. Depending on the part type, these products may fail to meet your requirements, or even present a danger to the circuit or the mission. The best minimum mitigation is to always procure parts from a reputable, authorized distributor, who is likely to have corporate procedures in place for some level of protection against risk of counterfeit and/or tampering.