How did you handle their filing before the move? Did you file it immediately or did you have a set time in your routine that you did it? I ask because I've known others (and often myself) filed as I went and sometimes I let it collect until the end of the day or week and did it all at once.
Short of asking them to separate out what is filing and what isn't and having a "to be filed" folder or basket in their offices, you may want to create a routine where you accumulate what needs to be filed in their area. Being busy executives they may be reluctant to do the separating for you. Plus if the information is sensitive in nature, they may be reluctant to having it laying about in their offices.
But in any case, think of a couple of workable solutions and the next time you have a chance to bring up the topic, ask for their input. In the meantime, look on the brightside: going up and down those stairs while time consuming is great exercise.

Michelle
