I'm not aware of many Disneyana collectors out there who collect Disney 8mm films. If you find one, they will certainly want the original box in good condition. The box has more value than the film, because if you try to run an old movie through a projector, it will probably break into small pieces. Age has made the old films stiff and brittle.
There is currently a VERY similar item on eBay you may want to watch (search Disney 8mm) that starts at $500. There is no picture, no description and the seller is a "zero", meaning he is new to eBay and has never completed an auction. But you never know what will happen on eBay!
I'm afraid the film you have has very little value to a Disney collector, perhaps $5-10. With the original box in good condition, $15-30.