May a player try to hunt again if his cards were sniped?
From the BGG FAQ about snipers and saboteurs


  Q. If a player has been sniped or sabotaged while resource gathering,
  is he still required to use or discard the other cards he played for
  hunting/hiring, digging, or drawing?
  
  A. No, only the card that was sniped/disarmed is discarded, and all
  other cards involved in that action can be taken back into hand and
  re-purposed to perform a different hunt/hire, dig or draw action, or
  to do something else entirely.


Yes, they can re-use the item(s) and attempt the action again (this is specifically stated in another thread by the designer).