Claim them when you cross the border on your way to Toronto. They'll give you a receipt for any taxes and duties you may pay. Since you're a keep your receipts kind of guy, you'll have proof you declared any stuff you purchased during the first part of your trip.
But I'd suggest waiting until after you cross the border the first time for any big purchases you make in NY since you'll pay 8% PST on taxable goods when you're going into Ontario.
|