Red binder with vintage stamp collection

I lost my red vinyl binder with a vintage stamp collection yesterday around 3pm near Courthouse Square on Montezuma Street in Prescott. It’s a 6x9 inch red binder with a tiny gold crest on the spine and a little crease on the top corner from a few years of use. Inside are mint-condition stamps from the 1950s on green stamp-pages, plus a couple of air-mail stamps with odd perforations. On the first page there’s a faint pencil note in the corner that reads 'HB'. This collection means a lot to me because it started with my grandfather, and I’m really hoping it turns up.