I sold a site last week at sedo and after 4-5 days I've received email that buyer has made payment and I shoud push name. First thing that was suspicious is that in email wasn't my name, only " dear sedo member" and second that I should push domain. Sedo rules says if you sold site you should first send files of site and after buyer install it you pushing name. After that I was check my old emails from sedo and saw that godaddy account number is different. After that I log in to sedo account and check transaction history and saw it wasn't updated. I've contact sedo and they confirmed that buyer is involved in fraud. So first thing you should do is check you transaction history in sedo account before you transfer name you sold there.