I'm pretty sure it's from 1936. The Silly Symphony cartoon "Tortoise and the Hare" was released in 1935 and "Three Little Wolves" (a sequel to Three Little Pigs") came out in 1936. The art for Mickey matches the style used on another Post Toasties box flat in my collection (posted below)...so my money's on '36.
The baseball game's pretty common, and cutouts from boxes don't have too much value...maybe $10-$15. Still a great little addition to any collection.
