I have BCU1525's with passive heatsinks, no I don't have black boxes.
new for 2300USD (fresh untouched PCIe teeth grinning right back at ya)
and used for 2000USD (with free minimal dust and tested like bitmain)

come get em, life is short and we don't got a lot of time. Please don't waste mine xo

PM / Telegram

@devorion