There should not be any problem using an outdated recovery project if there have not been any changes in the Forest configuration, such as adding or removing DCs, changing FSMO roles, changing DNS or IP settings, changing accounts passwords, etc. Verification detects these changes and warns if something is wrong. It is not recommended that you leave the Forest Recovery project unverified for a long time based as many of the settings that are verified can change over time.
Please note, there is no way to determine if there would be any issues during or after the restore operation when using an old, unverified Forest Recovery Project.
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