unable to open multiple Box accounts

My son sent me several reports that he wants me to integrate into one report.  He sent them in Box ( I dont know why) he does not understand much about computers or programs.  I opened my own new Box account but the rest of the reports he sents wants me to open another NEW Box account to see it !  I just want to pull  them all  into one Box account so it can be shared in a integrated report.  HELP!!!!!  I am up against a deadline!   And an 81 yo mother with a moderate IT education!