I got an interview with an accounting firm and they asked for unofficial transcripts, why don't they ask for

officials ones, how do they varify that the information is correct? or asking for unoffical is a test to compare for offical ones?I got an interview with an accounting firm and they asked for unofficial transcripts, why don't they ask for
The only thing that makes official transcripts ';official'; is the embossed stamp on it. The information is the same and therefore official transcripts are not really all that necessary.