Haven't bought anything off eBay lately but I used to make similar requests for safe packing. Some sellers would do a good job, others didn't seem to give a hoot (and I'd end up mailed a box of loose marbles rolling around, with some fine busted up glass at the bottom). After all, say you're buying 100 marbles for $10 and expect the seller to spend the time and material to wrap each one individually? It can be a bit of a crap shoot. I'd always leave good feedback for the sellers that took the time.