I mailed a $280 wedding gift and never received a thank-you note. I fear the gift was lost or stolen. Is it gauche to ask?

Dear Moneyist,

I attended a destination wedding in the spring. I didn’t bring a gift because I didn’t want to carry a large item with me on the plane and then make the newlyweds transport it home. The couple didn’t have a registry, but a month ago I bought them a gift and had it shipped to their New York City apartment. It was a Le Creuset cast-iron Dutch oven that cost $280. 

I…