Deer CAN reuse a bed, but aren't tied to it. During the rut, bucks will bed ANYWHERE they can be near does that smell " close - or ready ". I've seen beds that I'm sure were buck beds due to their size, smell ( eye-watering tarsal scent ), amount and size of turds of varying age, and location. I also look for the location of urine in the bed. That'll tell you whether the deer using the bed was a buck or doe as well. The fact that they were solitary, with no other beds anywhere near, and had a roaming, non-stop kind of track going into the bed ( snow evidence )pretty much sealed the deal as a buck bed in those instances.
I agree with Bur on the after-season scouting plan. A LOT can be learned on snow ( if any ) and just by slowly prowling around after hunting pressure is gone.