You're holding a golden ticket, and you should use it with confidence.
Your St Kitts and Nevis passport, with that valid US visa stamped inside, is your main character moment. The expired Syrian passport you cannot find? Leave it in the past where it belongs. From everything we've seen, dual nationals traveling on a passport from a non-restricted country, especially one as sunny and adventure-ready as St Kitts, are not the target of current travel restrictions. Customs and Border Protection (CBP) officers are looking for consistency, not a complete archive of your citizenship history. You're flying on a clean, valid document from a visa-waiver-friendly nation. That's your power move. This is the kind of bold travel energy we live for, just like chasing that Gibraltar or bust: chasing the longer 2027 eclipse glow solo vibe or mapping out your 6 Days of PTO Left: Let's Find Your Dream November Adventure. You're already one step ahead.
Now, here's the practical glow-up for your squad. Bringing an expired passport you can't even locate isn't just unnecessary, it could create confusion where none exists. CBP asks for the travel document that matches the visa. You have that. Your St Kitts passport is your ticket, your identity for this trip, and your shield. The fact that you also hold Syrian citizenship is a background detail, not a red flag, as long as you present yourself as a citizen of St Kitts. The rules are clear: travel on the passport that holds the visa, and you bypass the headache. No need to dig through old drawers or stress about lost paperwork.
One specific takeaway for anyone in a similar spot: pack a photocopy of your visa page and your St Kitts passport bio page in your carry-on, separate from the passport itself. It's a small prep that turns a potential "we need to verify" pause into a quick "everything's fine" nod from the officer. You've got the energy, you've got the documents, and you've got an epic trip ahead. The only question left is whether you'll be asked for that expired Syrian passport, and based on every traveler report we've seen, the answer is almost certainly no. Walk through that airport like the unstoppable main character you are.