I would forget about it. It is just money spent on education.....now lets all get new diodes from a reputable manu in a nice black plastic tray like I do. It is cheaper to buy a tray sometimes than 5 or 6 diodes....plus you save on shipping. Some maun's will sell partial allotments if they have an open tray. That way you know it is good. One of my suppliers even offers a return or exchange if the diode I order does not perform as needed{IR only}. But then again I have baught a few from them....they are also US based.
You are the only one that can make your dreams come true....and the only one that can stop them...A.M. Dietrich