Alright I was reading some of these threads so I decided to test them. Turns out that Treyarch did NOT make a typo. You need to have a PaP colt, bowie nife, jug, and molotoves+nades. You kill the monkey in the furnace with your colt, then the one in the cage, then the one thats on the roof. She will say "you win, GAME OVER" (she's just mad that you won, she's a tad of a sore loser). Then the type 99 and I believe the sawed off shotgun will BOTH be in the box. I don't have video proof of using the Type 99 but i've done this strategy twice and both weapons appeared in the box. Do NOT flame me saying that this is a lie, because follow my instructions and you will get the Type 99. This mystery is OVER. (P.S. the type 99 is very good when you shoot zombies in the head)

Well I hoped this has solved all of your problems, if anyone has trouble or claims this does not work, add me on PSN (CeNSoR-) and I will prove you wrong.

EDIT: You need to have 2 PaPed guns. You need the colt in your inventory and you need another gun to shoot through the cage at the one teddy. Also, only the person that has all of the items that the fly trap shows when activated can get the type 99/sawed off double barreled-shotgun.