Again, not my coins, but they could be soon! I can't tell if they are large or small S! From afar (the best pics I got) looks rather large in relation to the date. Here is just another one I found that could be large S. Thanks.
http://www.lincolncentresource.com/1928mintmarks.html Pictures are a bit too blurry for me to confirm, but picture one seems possible, as the 'S' appears a bit "longer".
I would say neither are the Large S, sorry. Photo #1 just looks like the regular Small S has been smushed.