text: OLAF’s own staff or by any outside body authorised to do so on its behalf. 
  
  Such checks and audits may be initiated at any moment during the provision of 
  the services and up to five years starting from the payment of the balance of the 
  last specific contract issued under this FWC 
  
  The audit procedure is initiated on the date of receipt of the relevant letter sent 
  by the contracting authority. Audits are carried out on a confidential basis. 
  
  **II.24.2**The contractor must keep all original documents stored on any appropriate 
  medium, including digitised originals if authorised under national law, for a period 
  of five years starting from the payment of the balance of the last specific contract 
  issued under this FWC. 
  
  **II.24.3**The contractor must grant the contracting authority’s staff and outside personnel 
  authorised by the contracting authority the appropriate right of access to sites and 
  premises where the FWC is implemented and to all the information, including 
  information in electronic format, needed to conduct such checks and audits. The 
  contractor must ensure that the information is readily available at the moment of 
  the check or audit and, if so requested, that information is handed over in an 
  appropriate format. 
  
  **II.24.4**On the basis of the findings made during the audit, a provisional report is drawn 
  up. The contracting authority or its authorised representative must send it to the 
  contractor, who has 30 days following the date of receipt to submit observations. 
  The contractor must receive the final report within 60 days following the expiry of 
  the deadline to submit observations. 