Thanks Donal, I wondered about that but I've won a few of their other $1 no reserve auctions and some were very low so I don't think that's whats happening here... Yeah, a bit annoyed it's revealed my max, but it's only a "placeholder" bid and I might go higher if I need to at the last minute depending on how busy I am at the time and how full the workshop looks...

Good tip flossy63, thanks. In the other auctions I won from this bidder (local clearing out an estate) the (several) other bidders have hundreds of feedbacks so I think in this case it's all genuine. But I've set my notifications and I'll definitely look out for that from now on....