Looking at them, you could try hinges for daiwa, maver and Leeda boxes, those are the same, as long as you have matching pairs for extra tray you will be ok,
Try fishingtackeandbait.co.uk, its online based in Ireland, or Todber manor fisheries, or Soar Tackle in Kegworth, Barford Tackle in Norfolk
You will have to get the addresses yourself, but they are Colmic stockists