Answer:
The answer is a heightened risk of fraud
Step-by-step explanation:
When this (the scenario in the question) happens, it is a red flag and a fraud is likely to have happened and the auditor should treat this as a high risk.
Management intention might be to conceal a material information inorder to pepetrate fraud or the truth might be that the documents for the acquisition is truly lost.
The auditor should also consider the materiality of this event when forming their opinion on the financial statement
In a nutshell, this case poses a risk of fraud.