---

@davewil1964wrote:

I suspect the OP doesn't use one.

 

 

---

On eBay it wouldn't matter anyway, as proof of posting still isn't going to get a seller anywhere with an eBay request. 

Still, it's good info to know for sellers of untracked, large letter items (I do know sellers that have won PayPal claims using one to establish proof of postage, at least).