I found over $60 in a closet today!! WOOHOO!!
It wasn't really $60 in cash, and it did take a bit of effort on my part (went to store #1 with one kid, went to store #2 with both kids). See, we are cleaning out the guest room/storage room/third bedroom in order to convert it into our son's room, and we are moving very slowly. Today I decided to take two never-been-opened items to their originating stores to see if I can return them.
And hurrah! I was able to return both, netting me over $60 in store credit. Fortunately, we shop frequently at each store (Walmart and Home Depot) so the store credit will surely be used soon.
The moral of the story here is to return items on time and reclaim your money - no need for the stores to keep it if you want it back!!