Fixed assets - physical verification and accounting

Our firm is conducting Fixed assets Physical verification in one manufacturing company (XYZ Ltd). During verification, we find many Fixed assets which are not accounted in books. There are 2 reasons for this. 1) Some assets are constructed within company. Like stores material steel and small spare parts issued and charged to consumable but ultimate fixed asset not accounted. 2) Earlier, xyz ltd sold some fixed assets to ABC Ltd in a deal 10 years ago. That time that ABC Ltd forgot some assets in XYZ Plant location only. Now these assets are property of XYZ Limited only. We would like to know what should be done for these assets found in physical verification but not accounted in books