Yeah unless someone thinks theirs looks exactly like yours, there's no possibility for ID. The big white has phal amabilis in it, like all complex white phals. The labellum is a dead ringer for p. amabilis, but the lateral petals are quite different.
Maybe they don't want to have an ID. Settling on a name with just comparisons would be orchid identity theft. Unfortunately the sercurity service pack in not available for Windows 'Phalanenopsis'. Which by the way would be a cool name for the next OS. Ok I'm done now. Pretty phals. Reminds me I need to get some more for my collection.