[tamajiv176]

I’m going to say the batteries leaked and I threw them out for safety reasons.

That would hopefully save me from them asking to return the item.

Sounds good, but unless you want to anonymize yourself further, I don't see why a drop should be used.

If It was an AR (Advanced Replacement) whereby you'd want to avoid sending the Item back and being billed, then that's understandable.

Is there any danger of the new owner of the earphones (remember I found the serial on eBay), trying to register his/her new purchase and discovering it has already been registered?

Can that be linked to me?