flatpack Integrated circuits, yes have a lil bit of precious metals, do search for how others process, they may crush ir run in ball mill ect?
what I do is torch a bucket load, then crush, disolve in acids then decant liquid off majority of sludge, filtering it, then put sludge in almost empty filter, pour in alittle fresh acid then rinse water.acids nitric then aqua regia
also have used HCl/Cl, or HCl/32%H2O2,
read through forum or search flatpacts should find another mans way of doing them.
I harvest several ways, heat gun, just pocket knife cut legs two sides pry off, plyers grab and twist em off, small electric oven stick boards in pan solder when board solder is melted pull out board using plyers slap board on metal table all most all the parts and solder slapped off, several other ways this can be done.