Ooooooooh!! Your pie safe is to die for! VERY nice. Values can fluxuate a lot, depending on where you live and where it was being sold (retail antique store or private sellers) but these are quite in demand and yours is a VERY, very nice one. I can't believe that got left behind, what were they thinking?!!!
Pie safes were intended not to keep the pie safe from the husband and the kids, but the inevitable flys, bugs and rodents that would raid the kitchen when they smelled a good pie baking! The punched tin (or copper) panels allowed the air to circulate and cool the pie, but kept the critters away.
There is a museum (or reasonable facsimile there of) that is identifying pie safes and categorizing them by the tin panels. I will try to find their Web site. They would be most interested in yours and can probably tell you a whole lot about where it came from, as well as value. Give me a sec...