I'm missing 4 z-fighters exibits. The 2 on the wall and the 2 under Gohans..

I will give you a list and find what you don't have..

Baba's ball :
Finish the game and then talk to Baba, on Yenma's office.
Gohan's training sword:
On Goku's house, go to the toybox and search it for this item.
Ox King's hat:
Talk to King Ox in Goku's house
Ginyu's Capsule:
Talk to a scientist in the left side of the main building of Capsule Corp.
Android #20's Hat:
After killing Kid Buu, return to the train. On the place where people usually were, you will find 2 enemies. Defeat them for this box.
Goku's Power Pole:
Outside of Babidi's spaceship in the Southwest Forest, go to the top right corner and use instant transmission to open the chest.
The Bansho Fan:
Break the level 140 barrier with Gohan in the East District 439 area and proceed to the end of the area to find the chest.
King Yemma's Mug:
After beating Chapter 11, open the level 145 door with Goten in Pilaf's Castle, proceed to where the Dragon Ball was found, and beat the enemies.
Broly's Crown:
Defeat Broly at the volcano.
Yajirobe's Sword:
Walk around Yajirobe counter-clockwise three times and he will drop an item near Babidi's Spaceship It is the artifact Yajirobe's Sword.
Yamcha's Bat:
Get to East District 439 and smash Gohan's level 140 door, then recieve it in a chest.
King Kai's Hammer:
Go to the Cave of the Ancients on Grand Kai's Planet after completing the Other World Tournament and talk to Bubbles.
Grand Kai's Boombox:
Speak to Grand Kai on Grand Kai's planet after you defeat Kid Buu
Mr. Popo's Turban:
There is an invisible chest in front of four trees on Kami's Lookout. Check between the middle two
Korin's Cane:
You will receive the Z-Fighter exhibit Korin's Cane from Korin himself after you give him red snapper fishes.
This all I can remember hope I helped you...