you might wanna leave the drive alone and leave no trace if you prefer not to be asked any questions. if you wanna play it risky than wipe and try to make up some good things to say to him just in case if he asks any questions, don't act weird and try to act 100% normal, make it look like you are being honest the best you can and don't overdo it or underdo it. get the acting just right. if you do underdo/overdo you will make it clear you are lying. you can be honest if you want to but it probably won't end up pretty.