Thanks a lot for the lead. Interesting update. I found an old spreadsheet. It has my username and password, but for the website it just has "cry". I imagine this was the first 3 letters of the site. I know this is the one where I did most of my transactions. And thinking back, it was probably in April, May, and June of 2013 if that helps at all.
cryptopia.
and if my guess is right, then say byebye to your coin. they do fraud lol. i lost 3BTC too. and the new info, they under the NZ court. you could check google.