If I had been asked to provide a work sample via mail/fax/email I would probably include the following:
1 excerpt from a recent prompt book for a show of similar type - probably 4 pages (2 pages of script with the related 2 pages of blocking/notes/etc)
1 call sheet
1 rehearsal report
1 performance report
1 page of script extraction
1 detailed floor plan (if you have one to hand - the thing with floorplans is they are really hard to mock up)
Usually, it is just a matter of flipping through a similar production book and getting a sample of as much as you can, but keep it under 10 pages.
That said, if I was not specifically asked to provide a work sample, and was going to an interview, I would just bring the entire book from one of my shows (Well, provided I had enough notice to get one out of document storage)