P.S.  I STILL DON'T KNOW WHY they requested all that documentation from me.

Even after I uploaded all my receipts and invoices, they still asked for "*****PROOF OF PAYMENT****"  <--- (how eBay wrote it), which I assumed to be bank statements.  Which was why I started to call eBay Customer Care and feeling whether this was a scam or not.

Some specifics of what they asked for (cut and paste from eBay message--->):

 Who the supplier / company is from which item is purchased

- The price and quantities of items purchased

- The dates in which items were purchased

- If from a third party supplier, the name of the purchaser and address (to verify you are the one purchasing the items for sale)

- *****PROOF OF PAYMENT****

And this was AFTER I had uploaded my invoices, receipts, authenticity certificates, guarantee card (with my name on it and the shop stamps).

Still think it's weird ... anyway, glad it was solved (thanks for the advice guys!), but unlikely I'll be bothered selling on eBay again 😛