I don't know what's up with Radioman's collectible bonuses. If it's just him then let's chalk it up to a glitch with his game, or maybe he just missed it. If others are reporting the same problem then maybe we should look into it more closely.
Added: I just used the Japanese Save Editor to compare the sequence of pickups in "clean" In the Beginning saves for PS2v1 and PCv1 and found a 1:1 correlation between all the pickups. I did not compare locations or ammo for the pickups, just that pickups 0 thru 554 are the same kind and type. The only differences I found were the extra 2 player pickups on PS2, and one of the save disks on PS2 was recently used to save the game - on PC I used a cleo script to save so the save disks are untouched.