If your agent follows procedure and you really want to bail out then he/she should have already submitted a notice to perform for the seller. Since the seller would be in default it would “appear” that you could get your deposit back. HOWEVER, the addendums that the REO seller usually has the buyer sign are pretty restrictive and may bind you to the deal even though it is the seller who is in default. One thing that puzzles me is if this is the place you really want, and it is a CASH deal, (so you are not losing a loan lock) is being a few days or even a week late that much of a show stopper or are there other factors and you just want an out? (not that it matters)
Again your agent should be able to advise you on this matter.