Navy Brooklinen duvet cover with monogram, Queen size.

I'm missing my navy Brooklinen duvet cover. It's Queen size, made of cotton sateen, navy with white piping and a tiny monogram 'AZ' in the bottom-right corner. It's in good condition, just a faint coffee stain near the edge from last week's busy mornings. I last had it outside the King Soopers on East Colfax Ave yesterday around 7:15pm, then clearly it slipped away while I walked toward the History Colorado Center. This duvet cover means a lot to me—it was a gift and I'd really appreciate getting it back.