I ordered some products from a toy catalogue and when I opened the box, instead of 1 item, they had sent 6. This item is quite bulky and worth about $25 each. I checked and they've only charged me for 1.

What would you do?
Am I legally obliged to tell them and return the goods?
It will be a hassle to get them (plus 3 kids) to the post office, can they tell me to post them back?
What would I do? I would find out what I should be expecting from them when I phone up - so not sure if is the ACCC but I would want to make sure I knew first what my rights were as far as payment for postage is, and then I would be ensuring that I actually got either a postage page sticker etc, or the money first (I have been bitten before by posting something back under good faith after being promised a credit for the postage which I then had to chase for several months to actually get the credit back).

I don't actually think 'ethics' come into it - it is about ensuring you are not out of pocket from their mistake.