We created a full sandbox from production about four months ago and have now noticed that there are no records in the OpportunityFieldHistory object other than those created after the sandbox came into existence.

Our understanding is that all data should be copied during the creation of a full sandbox - does this not include the OpportunityFieldHistory object? We did not have a sandbox template in place, so we know that was not the cause.

The Opps still exist in production and in full and the OppIDs match on both sides (so they are the original Opps).

Could we have done anything to have caused the history to be removed?

We created a full sandbox from production about four months ago and have now noticed that there are no records in the OpportunityFieldHistory object other than those created after the sandbox came into existence.

Our understanding is that all data should be copied during the creation of a full sandbox - does this not include the OpportunityFieldHistory object? We did not have a sandbox template in place, so we know that was not the cause.

The Opps still exist in production and in full and the OppIDs match on both sides (so they are the original Opps).

Could we have done anything to have caused the history to be removed?