Maybe some of these songs missing weren't singles in Australia / New Zealand? That would explain everything, can someone confirm?

yes release it only there!!!

Where's If I Never See Your Face Again? Such a hit

Kings of the smallest songs names when will Fall Out Boy?

This Summer not included? Mess

Where's Won't Go Home Without You?

Peak positions.

Australia
01. This Love #8
02. Payphone #2
03. She Will Be Loved #1
04. One More Night #2
05. Moves Like Jagger (featuring Christina Aguilera) #2
06. Wake Up Call #19
07. Misery #39
08. Maps #30
09. Makes Me Wonder #6
10. Animals #62
11. Daylight #19
12. Sugar #6

Singles missing from the Collection:

Harder To Breathe #37
Sunday Morning #27
Wont Go Home Without You #7
If I Never See Your Face Again #11
Never Gonna Leave This Bed N/A
Love Somebody N/A
This Summer’s Gonna Hurt #70

New Zealand
01. This Love #4
02. Payphone #2
03. She Will Be Loved #18
04. One More Night #1
05. Moves Like Jagger (featuring Christina Aguilera) #1
06. Wake Up Call #32
07. Misery #38
08. Maps #16
09. Makes Me Wonder #8
10. Animals #11
11. Daylight #11
12. Sugar #3

Singles missing from the Collection:

Harder To Breathe #33
Sunday Morning #21
Wont Go Home Without You #20
If I Never See Your Face Again #21
Never Gonna Leave This Bed N/A
Love Somebody #34
This Summer’s Gonna Hurt N/A

Mess @ Harder To Breathe not being on here

I think it's time for a greatest hits album, but they're missing some great songs. Wish it was being released worldwide.

Where is their If i aint got you cover?

I guess the track listing makes sense, at least in the US....

01. This Love (#5)
02. Payphone (#2)
03. She Will Be Loved (#5)
04. One More Night (#1)
05. Moves Like Jagger (featuring Christina Aguilera) (#1)
06. Wake Up Call (#19)
07. Misery (#14)
08. Maps (#6)
09. Makes Me Wonder (#1)
10. Animals (#3)
11. Daylight (#7)
12. Sugar (#2)

But um "Harder To Breathe" (their first single which landed at #18) and "Love Somebody" (peaked at #10) should be on there too.

I guess it makes sense that "Sunday Morning" (#31) and "Won't Go Home Without You" (#48) aren't on there cuz they kind of underperformed....as well as, "Give A Little More" (#86), "Never Gonna Leave This Bed" (#55), "If I Never See Your Face Again" (#51) and sort of "This Summer" (#23)....but there's no reason why HTB and LS are not there.