Since a large percentage of my + feedbacks remark upon the packaging quality,  I thought it might be useful to share some techniques which have evolved over eight years on eBay:

1 - Get rid of your tape for outside box sealing.  A far easier, more professional (and cheaper!) alternative is HOT GLUE. The glue guns retail $5>$10 and wholesale packs of glue sticks for about the same.  They provide positive and durable sealing. (Caveat: you have to "learn" the glue gun . . . this stuff is really hot and will burn your fingers if you touch it before it dries  -- 15 > 20 seconds, on average).
2 - SAVE BIG BUX $$$ on packaging supplies.  eBay and USPS have teamed up to provide free Priority Mail envelopes and boxes, delivered to your door. The link is: http://ebaysupplies.usps.com. Also, you'll find all the FREE bubble wrap, blanketing, packing peanuts, and export-grade boxes you'll ever want on craigslist.com and freecycle.com.  Forget shredded/wadded-up newspaper or other junk ...very unprofessional!  Remember: Packaging is Marketing.   (TIP: if you're handy with a box-cutter -- and your new glue gun -- you can turn any heavily-labeled box inside out.  This presents clean outside surfaces, ready for your own labels.) 
3 - "OVER-ENGINEER" your packaging of delicate/fragile ceramics and other breakables. Each piece should be blanketed in a double layer of bubble wrap, then sealed with transparent sealing tape (Scotch® markets a high quality tape-on-dispenser. This is one area where bargain-hunting may not pay.)
4 - Next, line the bottom of your carton with a fairly thick layer of bubblewrap or packing peanuts. Distribute your items by weight and relative delicacy.  After each layer, shake in packaging peanuts or bubblewrap scraps to isolate each piece from the others and box edges.
5 - Top off the box with enough peanuts or bubble wrap to bulge over the top.  Rock the entire box on each bottom edge to shake down the contents  (object is to compact the packaging and prevent any shifting of the valuables inside).  Test-shake again and listen for any interior movement.
6 - Insert your packing slip just under the folded boxtops  -- important for US postal or foreign customs inspectors to retrieve it easily.  (TIP: make sure the valuations listed on the packing slip agree with your customs declaration.  No "Gifts"!).  Finally, hot-glue the box shut . . . make sure to run your glue gun under each seam for a positive all-around seal.

      There's an infinite array of products bought, sold, and shipped on eBay ... each presents its own packaging peculiarities.  But using the techniques noted above, you'll virtually eliminate complaints arising from improper packaging. (Final Tip: If you do receive a damage report from a buyer, offer their refund or adjustment ON CONDITION THAT THEY PROVIDE YOU IMMEDIATE PHOTOGRAPHY OF THE DAMAGED ITEM ... TAKEN WITHIN THE CONTEXT OF ITS PACKAGING AND SHIPPING BOX.  This requirement works to eliminate fradulent buyer claims at the outset.  If it truly is a valid damage incident, your photography -- as proof that packaging was not the cause -- will promote a successful outcome for your claim against the carrier.

        Regards and Good eBaying!