I would NEVER buy from anyone who can't take the time out to answer my questions. If you think the communication is bad now, it would be worse if you had already purchased the item and the seller wouldn't respond so, consider yourself lucky that you found out before you were out money.
I can guarantee that you will be able to find the Coach item you want from another seller. There are VERY few Coach bags that are truely rare and with ebay having thousands of Coach listings everyday, i'm sure you will find what you are looking for with no problems.
PS: there is a thread in the Coach subforum where if you are looking for a specific Coach item, you can post a pic or style number ( or even a description ), how much you are willing to pay, etc. and more often than not, someone will respond and give you a heads up on where to find that item.