通帳

1. Origins, structure, and basic meaning

• Structure: 通帳 (つうちょう) is a bankbook recording account transactions. 通帳を記帳する updates entries; 通帳は…保管する topicalizes it as an item kept safe.
• Basic usage: One use prints transaction history after a long interval; the other keeps an important bankbook in a locked drawer.

2. Common pitfalls and similar expressions

• Bankbook updated and bankbook safeguarded
  • 記帳した means recording current entries in an existing bankbook, not creating a new one. The later sentence emphasizes secure storage of a valuable document.