You can always change a few prices the day of the sale if you change your mind. It's still easier than pricing everything that day. If the area you are doing is small, one basket with a handle may make it easier to cart everything back to it's place. It could be one of the categories in the PUT AWAY box. I'm sure you can think of many categories.
Different systems suggest using letters and numbers to mark each box.
If you expect to have changes, use paper labels that you can peel off and replace as your storage needs change. Tape the date to the box, tape it shut and forget about it for now. Remember, if you put something into this box it's unfinished business. You still HAVE to deal with it later. You've only postponed the inevitable.