And a new option for sourcing Back Issues BSI maintains a missing copy bank that serves as the first port of call when a customer reports a missing or damaged issue of a current print subscription. Issues are retained in the copy bank for at least twelve months. Rather than discard them after a year, we now offer older issues for sale − to customers or any interested individuals or organizations. Available issues are listed under the ‘Surplus Sale’ tab on our website www.basch.com and can be purchased from the site. New titles and issues are added daily.