Open Question: Insurance proof of ownership - help!?

I am looking for some advise on where I stand with my insurance company, the Royal Bank of Scotland. We were burgled and had various fishing and golfing equipment stolen along with items in a chest freezer (big cuts of meat, fish etc all purchased with cash). These had been given as gifts over many years and as such we do not have any receipts. The insurance company say they require proof of ownership (receipts of photographs), none of which I have. Where do I now stand as they say they will not pay out without these.