Travel insurance - need receipts for lost goods?

I signed up for World Nomads, a popular travel insurance. I noticed the fine print regarding lost goods states that "Items over $150 must be accompanied by original receipts.". But I've also heard elsewhere that you might be able to get by other ways to prove ownership: e.g. photo with you in it, credit card statement, manuals/box, etc... Original receipts are often not saved or never had if you purchased something used. Do "World Nomads" and other insurance companies absolutely require original receipts or can other proofs of purchases be used? If not, what are some things you can do to prove ownership and furthermore, ensure coverage for the amount you paid for your belongings (and not the appraised value)?
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Will travel insurance cover lost items?
Most comprehensive travel insurance policies (not basic, medical-only ones) include coverage for theft, loss or damage of your luggage and personal effects in a range of circumstances. These include: Many belongings that are lost, stolen or damaged, whilst they are accompanying you on your trip.What does the travel insurance cover?
Most travel insurance plans cover medical emergencies, trip cancellation, trip interruption, delays, medical evacuation, and lost, damaged, or stolen luggage.What is lost baggage insurance?
What Does Baggage Coverage Include? Baggage loss coverage provides reimbursement for luggage as well as for covered items of yours that are lost or stolen while you're traveling.Travel Insurance: What is the Baggage Loss Benefit and How Does it Work?
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