When i had the Policy, i was insuring two basses that i had bought second hand. They insure all equipment new for old regardless of if you have owned from new or not. The issue was proving ownership, which they said i could not do without either a receipt for the second hand purchase, a bank statement showing the payment going out for the instrument, or a valuation. Given that i bought both off here and i took money out from different places to pay for both so no lump sum, they would only indemnify me if i had valuations from them, which they accepted as proof of ownership (not value). Having contributed towards a few policy wordings myself i know what to look for, and what annoyed me is this was not stressed in the wording nearly enough, so i felt i wasted a couple of years premium.
I don't have that issue now as i can prove ownership with receipts and a bank transfer receipt which i trust they will find to be in order, however this thread is just asking what peoples experiences are when it comes to proving ownership when it comes to a claim.
I'll have a look at that Allianz policy,