On Wed, 16 Apr 2008 23:52:05 -0500, Sky
wrote:

Not that I
know any better, but I 'bet' the grocery store keeps tabs and deducts
the cost of the one 'unit' against its next delivery from the vendor.
Same thing goes for any other products I'd imagine.

Grocery "chains" refund on single items, and then discard. A truck
load of milk on the other hand is another story.