Yes., this has happened about 3 or 4 times this year, so far.

The items that were re-listed, unbeknown to me, were actually one-offs that were sold 

last August!!

I caught them in time, but only by accident, before someone bought them - again.

Now I'm watching very closely.

Another poster also mentioned last August as the time for their re-list by ebay.

Someone bought something this week that I couldn't find, and I panicked.   

Turned the place upside down. 

Turns out, I had misfiled it - paper goods - easy to do.     

I think it might be their sneaky way of handing out defects for OOS.