"I am so sorry, call it forgetfulness or simply laziness, I have been busy like always and don't ... " (more) check my emails on a regular basis, and when I do I almost never reply to anything except school related things. I apologize for the inconvenience."
"I am really sorry, not accustomed to auction websites and after hearing the auction ended, I steppe ... " (more)d away for a few days. I don't think I have the patience or desire to keep on top of these things! Again I apologize for the inconvenience!"