There is a term, "Holder, Pen" on page 336 of the book. It's a tertiary term under the secondary term "Holder, Writing Eqipment."
There is another term, "Tray, Pen" on that same page. It's a tertiary term under the secondary term, "Tray, Writing Equipment."
Both secondary terms are under the primary term "Container, Writing Equipment." These are organized under the sub-classification Writing Accessories (Category: Written Communication T&E; Category 6: T&E for Communication).
Do either of these two terms suffice for your object?