Here is my list of Tamatown souvenirs I made a while ago for my personal use. Ignore the passwords, they won't work for you unless your username happens to be KEIRI.
1. Passport: Upon arrival 13366 76275
2. Brochure: At Town Hall 27542 75436
3. Car: On the 1st day of the month at the Mall 49974 77451
4. Picture Book: At preschool 81462 75771
5. Organ: At preschool 03478 75604
6. Graduation Cap: At school, after completing school 68027 29326
7. Graduation Cape: At school, after completing school 44987 29494
8. Dumbells: At the Gym in Patchi's Forest 07030 77785
9. Treadmill: At the Gym in Patchi's Forest 29046 77617
10. Maple Leaf: Canada trip
11. N.Y. Shirt: New York trip 75417 06427
12. Sumo: Japan trip 85364 57065
13. Eiffel Tower: France trip
14. Elephant: Africa trip
15. Scepter: 20 000G donation
16. Sword: 70 000G donation
17. Shield: 200 000G donation
18. Stamp: At the Post Office 58902 78120
19. Box: At the Post Office 80918 77952
20. Smoothie: Convenience Store in Guruguru Town 12822 78456
21. Jug of Milk: Convenience Store in Guruguru Town 34838 78288
22. Hammer: Hardware Shop in Mame City 58294 80303
23. Ladder: Hardware Shop in Mame City 71446 79464
24. Drill: Hardware Shop in Mame City 94486 79296
25. Poster 1: Watch Fear in Tama Tower 25366 79800
26. Poster 2: Watch Love in Tama Tower 48406 79632
27. Photo ID: At the Office 50779 30165
28. Action Figure: Slot Game in Lucky Tama Toys 20054 81310
29. Gold Disk: On the 5th, 15th and 25th of each month in The Tama Beat 06747 30501
30. Wedding Dress: On the 10th, 20th and 30th of each month in Forever TMGC
31. Trophy: Do very well at the Bank game 87126 80806
32. Lap Top PC: Right door in the Office 31259 22951
Note that this is for the v4, but since v4 and v4.5 share the same Tamatown, I believe they have the same souvenirs.