Instead of saying not hacked you should say that you will provide a signed message for each account and when you posted those addresses on each account. That will give more confidence to buyers. Please confirm whether you can provide a signed message for each account?
Are these your own accounts or purchased from other people?
sign message must be available and OP's account also has fair post and it is very hard to join in signature campaign. Bitmixer is now open it is just limited slot, So if this account is sold already, i think the bitmixer campaign is closed because of a lot of potential participant to join them because of good pay rate and automatic payments. And OP must wait for his negative feedback because account selling is always got red mark from DT.