collectable game calls?

[Mr. 16 gauge]

Went to a garage sale on Sat....husband died last year and wife was selling all his hunting/fishing equipment.
Guns were long gone by the time I got there.....lots of bowhunting equipment (bows, tree stands, camo blinds, ect) and walleye fishing gear.
I didn't do as well as Adam Helmer does, but I did pick up a few things: got a half dozen tomato cages, a folding cloth camo seat, a Rapala fillet knife, and a P.S. Olt squirrel call.
The call is still in the box; doesn't look like it was ever used....still has the directions (box is beat up a bit). Was wondering: does anyone know if there is any collector value to old calls, and if so, where could I find such information?

Just curious.....if worse comes to worse, I will be using it next fall to call in some bushytails (hopefully!)