I have this Horner cabinet of Frank Dillon. I know it's Frank Dillon as it was sold with a number of different photos from his estate. I'm trying to get SGC to slab it and label it as Frank Dillon but they need proof that it's him. I've submitted pics of the other photos that were sold as well as the following comparison photos shown below, but it's still not quite enough

. Not sure what else I can do to prove it's Frank Dillon. Any help or advice would be greatly appreciated!
My cabinet...
comparison photos...