I’ve Never had to claim and have sold over 3000 pieces… Make sure your labels are very clear (mine are copy/pasted to avoid transciption errors), printed in black bold 26 size font and I sellotape over my labels in case of rain/damp. I have a return label on the back, not my full address but my business name, house number and post code… that is enough to get to me and inside my full contact details are always on my enclosed business card.
Fortunately I’ve not needed the return details either.
Don’t over think it. If push comes to shove you will fight your corner and win…pretty sure there are precedent examples to be found in the forum for claiming your work,
Hopefully you will never need to.
xx
Correction. I have made one claim in 10+ years… Paid up no problem at all