You'll be hard pressed to find this item in better condition.
Hewlett-Packard HP-42S RPN Scientific Calculator Open Box! Complete Vintage 90s Tested
Complete in open box. Box is in very good condition, contents are in excellent unused condition. Original batteries have been replaced, but will also be included in case the new owner wants all the original parts (see last photo).
Includes:
Original retail box with hang tag
Plastic packing inserts
HP-42S RPN Calculator
Case with cardboard packing insert
Owner's Manual, 351 pages
Product Registration Card
Accessories and Applications booklet
Extended Protection Plan booklet
Receipt dated 02/22/91
Original batteries (dead)