Those are from our 'dessert' pies (apricot and apple - the kind that come 4 to a box). I have a box of them (empties - the inlaws are packrats, and NEVER throw anything away. They even keep broken stuff.) to work with, so it's not like I have a shortage or need to buy more.
The 'family' pie tray is about double that size radius.
I haven't bought a meat pie with a tray in years, but they're a bit larger than the small ones used here.
Hey! Where'd ... Everybody ... go?