In case anyone is interested.. some of these items are up for auction at the moment..
Zork I map:
http://www.ebay.com/itm/Infocom-Zork...item4cfca090e7
Zork II map:
http://www.ebay.com/itm/Infocom-Zork...item4cfc8dc868
Zork III Map:
http://www.ebay.com/itm/Infocom-Zork...item4cfc8e4572