Well done, Mallows - best outcome for new owners and your ewe lambs.
As to thinking that teasers and rigs paying attention and trying to mount means the girls are not in lamb... err, it's not quite like that.
The tups will try it on. When the ewe is receptive, she'll stand for the tup and he'll then successfully mount her, leaving paint on her rear to prove it (assuming you have raddled his chest and keep that topped up.) A ewe's cycle is 17 days; she will be receptive for less than 24 hours and then again 17 days later. Therefore on any one day you would expect only about 1/17th of the ewes to be receptive to the tup. You may get a higher proportion receptive immediately on introducing a tup if the girls have been running next to a tup for a while, but it won't be as high as 50%.
Any ewe lamb showing receptivity to the tup today was quite likely not cycling yesterday, so would not have been 'seen to' by the neighbour's tup. Equally, any ewe lambs receptive yesterday would probably have gone off the boil by today anyway, whether or not the tup's attentions were successful.
So if you do want to know which ewe lambs are definitely not in lamb, you will need to raddle your rig / teaser and run them together for 18 days (keeping the raddle topped up.) Any ewe lambs at the end of this period with
unpainted bottoms
may be in lamb, or may simply not be cycling yet. Those are the ewe lambs you will want to get scanned in December. Ewe lambs whose bottoms get painted by the rig are
not in lamb.