No never tried it but numbers a data dont lie. Im sure if all your boards were from 1965-1993 then you would expect to get a higher board grading. And if you dont i would look into a new buyer. Even 100lbs of them would mean double or triple the amounts of PMs recovered. I still dream of the day i can get a few tons of 1970's computers. Probably would be my first attempt to do a commercial refining route. This 1995 and onwards the PM amounts become tiny and you need more material, more cost, just to even get close to the smaller amount of older gear.
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