Things the Bradys Found in Tiger's Doghouse...
Kitty Carry All
Bobby's Kazoo
Myron
Bobby when he thought that he had mumps

Things the Bradys Found in Other Locations Throughout the House:
Carol's Earrings
Marcia's trophys
Jan's locket

you forgot one. OLIVER!

I forgot another one. In the tattletale episode, Tiger took the certified letter that Alice received for her hi fi and he hid it in the doghouse.