Monkey Spanker,
When I first started stalking I used a large fish crate..I was on holiday in Hastings and there was loads lying around where the fishing boats moored in the harbour and all I did was offer one of the fisherman a fiver for one..
The boxes are very strong, but what I didn't like was that because of the mouldings on them and their general shape, there was much less usable space inside them than their exterior size suggested. They were ok with Roe but i was never happy trying to cram a Fallow in them...
Regards,
Peter