Box's FTP option now supports the ability to preserve files' original created and modified date/timestamps during an FTP transfer to Box. These timestamps will be visible on Box to satisfy compliance or regulatory requirements. See Understanding Box File Timestamps
Caveat: Most FTP clients support the ability to send a file's original modified timestamp during a transfer, however, most DO NOT support the ability to send both the original modified AND created date/time during a transfer. Please consult with your FTP client's support team to confirm the available capabilities.
For more general information about Box FTP, please see our Using FTP with Box article.