The front of all invoices must be date-stamped upon receipt in the CRS program office. If the envelope is date-stamped, keep the envelope as part of the paper case file. If the invoice is received via email, print the invoice and stamp it with the date received in the office. For faxed invoices, if the date on the fax tagline is correct and up-to–date, then that date reflects the date received in the office. Document the fax in the paper case file.