Someone must have gone to the bank and gotten some ones that were sequential and spent them in the same stores you shopped in about the same time.
I won this New Zealand $1.00 solid radar through World Bank Note auctions: A year or more later, I bought this note (blindly: b/c they only provide a stock photo) from Allen's Coins of Ohio:
You should immediately get out and play the lottery – The chances of you winning the lottery must be better than randomly getting those two notes like you did!
-Haha! It did the opposite (buying the next note so many months later, just made me realize I must slow down: was buying far too many notes!)