My single hashboard sales are doing well on ebay
https://www.ebay.com/itm/164980585543?i sell for 288 and clear about 240 so 960 if I sell four boards.
I get about 140 in selling the shell and the fans and the controller.
so a unit pieced out on ebay is around 1100 net.
Of course returns and scammers abound on ebay.
So realistic guess is I clear 900-950 at worst and not 1100.
These units were purchased in part direct from bitmain new. In spring of 2018
or used on ebay and this site in dec 2018 to feb 2019.
They are mixed and I cant tell which one I am selling.
ebay
bitcointalk
bitmain.
I ran them from freq 350 to 400 depending on the mines temps.
Testing cleaning and selling three pieces is doable.
I rate them B or B+ not A- or A
Not sure what price should be. what do you think you would pay for 3 of them?
3 x 700 = 2100 free shipping .
I clear 2000
vs parting out on ebay Slower but I clear 2700 to 3300.
There is something to be said about selling the three to you and parting the others.
I am ballparking the L3+ prices but
2100 for the three cleaned and shipping is about as low as I should offer. I would take btc ,ltc ,doge ,eth coin escrow my self and offer you 48 hour testing.