I think this is accurate but here it is:
Intro
e|---------------------------------------------------------------------------|
B|---------------------------------------------------------------------------|
G|11111111111111111-7777777/999/777/111111/7777------------------------------|
D|xxxxxxxxxxxxxxxx--xxxxxxx/xxx/xxx/xxxxxx/xxxx------------------------------|
A|9999999999999999--5555555/777/555/99999-/5555------------------------------|
E|---------------------------------------------------------------------------|
[ Tab from: https://www.guitartabs.cc/tabs/b/box_car_racer/i_am_tab.html ]
Chorus
e|----------------------------------------------------------------------|----|
B|----------------------------------------------------------------------|----|
G|7777777777777777-------------------7777777777777777-------------------|7~--|
D|7777777777777777-99999999-55555555-7777777777777777-99999999-55555555-|7~--|
A|5555555555555555-99999999-55555555-5555555555555555-99999999-55555555-|5~--|
E|-----------------77777777-33333333------------------77777777-33333333-|----|
Verse
e|---------------------------------------------------------------------------|
B|---------------------------------------------------------------------------|
G|7777777777777777777777777777777777777777777777777777777777777777-----------|
D|xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx-----------|
A|5555555555555555555555555555555555555555555555555555555555555555-----------|
E|---------------------------------------------------------------------------|
Interlude
e|---------------------------------------------------------------------------|
B|---------------------------------------------------------------------------|
G|-77-7-777-99-9-999---------------------------------------------------------|
D|-77-7-777-99-9-999-99-9-999-55-5-555---------------------------------------|
A|-55-5-555-77-7-777-99-9-999-55-5-555---------------------------------------|
E|-------------------77-7-777-33-3-333---------------------------------------|
Chorus 2:
e|---------------------------------------------------------------------------|
B|---------------------------------------------------------------------------|
G|7777777777777777777777777777777777777777777777777777777777777777-----------|
D|xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx-----------|
A|5555555555555555555555555555555555555555555555555555555555555555-----------|
E|---------------------------------------------------------------------------|