I wouldn't worry about it either. Some years ago I lost my wedding ring (that should have been the first sign!), the insurance company wanted a photo of it to prove I actually had it (no receipt), that it was gold (at least in colour), rough size etc. I had no photos of it to speak of except my actual wedding photo. I gave them that and it was accepted. I even got more than we actually paid if memory is correct.
So I think any photo will do, if it shows what it is, that it's in your possession and a date.