These are difficult to identify unless someone has one. I say this because I bought one at a major nursery a couple of months back and only realised it was tag-less when I got home. I went back and it took the nursery about an hour to discover what it was, and that was only after me insisting that they found out.
I don't know if you are able to ask the store ?
Another suggestion is to look through photos on the internet at sites that sell odonts.
maybe its a "wildcat" ? look at wildcat yellow on attached link
oncidium