I kick myself for not asking for receipts of many coins I have purchased in shops, fairs etc. as these easily account for half of my coin money.
I'm thinking maybe it's the moment now to carry out a proper valuation, put an overall figure, insure it, and from there on maintain proper records as you point out.
I guess my fear is that after all this trouble, I get burgled eventually and my insurer doesn't accept my claim because the valuation is three years old.
Thanks again for your help.