You can just bust in there and try to find the beds. Beds are usually easy to see in grass or swampy stuff. Are there humps of dry land in the swampy areas? Deer love those. Getting late now to do that, but you could if you only go once and don't mess around. Just cruise through without stopping.

Unless you saw the deer rise from a bed (maybe you did), you really can't be sure it was bedded. It may have been moving or feeding.