What do you think about this and this?
The first one is clearly not ivory, although the chanter sole might be (old Hardie chanters are very difficult to reed). A seller claiming complete ignorance, including mis-spelling "RG Harding", is a definite red flag; after they've sold you some crap they insinuated were ivory mounted Hardie's, they'll claim complete ignorance and that they acted in good faith.

The second set might be; hard to tell from one fuzzy photo. I have an ivory mounted Lawrie chanter; it'd be highly unusual for real ivory to be that blindingly white with that kind of age on it. Only one feedback, and that's negative for misrepresenting an item and refusing to refund the seller's money.

The third set is grossly overpriced, particularly with cracks. "A good new set of pipes made in Scotland will cost you upward of $1800.00 and tax. Then is takes about 20 years for the tone to mellow (so I'm told)." BOLLOCKS. "Hardie Pipes were quality manufacturers of Scottish bagpipes." Debatable depending upon when they were made and under what contract.

I wouldn't risk my money on any of them.