Divisible By Zero

RankItemQuantity
#650A Beginner's Guide to Charming Snakes1
#247A Crimbo Carol, Ch. 11
#279A Crimbo Carol, Ch. 21
#256A Crimbo Carol, Ch. 31
#223A Crimbo Carol, Ch. 41
#295A Crimbo Carol, Ch. 51
#20Boris's Helm1
#1118CRIMBCO Employee Handbook (chapter 1)1
#1013CRIMBCO Employee Handbook (chapter 2)1
#1053CRIMBCO Employee Handbook (chapter 3)1
#1020CRIMBCO Employee Handbook (chapter 4)1
#1009CRIMBCO Employee Handbook (chapter 5)1
#1215Crimbo Candy Cookbook2
#118Crimbot ROM: Mathematical Precision1
#135Crimbot ROM: Rapid Prototyping1
#111Crimbot ROM: Ruthless Efficiency1
#105Ghost Pinching Quarterly1
#257Inigo's Incantation of Inspiration3
#837Kissin' Cousins1
#848Maxing, Relaxing1
#598The Art of Slapfighting1
#684The Autobiography Of Dynamite Superman Jones1
#701Uncle Romulus1
#650Zu Mannkäse Dienen2
#626antique bottle opener1
#535antique painting of a landscape1
#354antique pair of blue jeans2
#609antique record album3
#384antique souvenir drawing2
#4836box of sunshine8
#2111chunk of depleted Grimacite1
#129slime-soaked brain2
#204slime-soaked sweat gland1

Wow, that's 49 items total!

what items are this player missing?