Final answer:
Shann's sons' items are not specified, but they likely include important family documents, heirlooms, rare books, manuscripts, or valuable artifacts, all of which need careful preservation.
Step-by-step explanation:
The items that Shann's sons put into a safe place to save for future generations are not explicitly mentioned in the provided text. Based on the context and examples given, it is reasonable to infer that such items could include important family documents and heirlooms, rare books and manuscripts, or valuable artifacts and paintings; all of which are physical items that can be bought and potentially sold at another time. Collections like pottery, basketry, and cultural objects, which may be included in heirlooms, typically require careful management to preserve them.