Hi Dina, Great to hear you are under $300 and that you'll take the receipts. You'll be covered then.
I have not had a bad experience, but I know well how the customs officials work in Latin America. Also, goods are sometimes more expensive there than that we find online here, and so they don't believe the price of things (specially those that come from the $ star). If they see people with lots of baggage, they don't do the random check system (red/green light button - you'll see when you're there), they just pass you to inspection directly because it's likely you are brining in more than $300. Without the receipts, they can assign any amount they want to your merchandise. Anyway, good luck with the packing. The list sounds like a great idea! Sending good juju your way Dina! H