We've searched the internet and found the largest collection of On30 Scale trains for sale is on eBay. Below are the listings for 'boxcar'.

BINKLEY KIT BUILT HOn3 NARROW GAUGE DENVER RIO GRANDE DRGW BOX CAR WAGON 315 nd
BINKLEY KIT BUILT HOn3 NARROW GAUGE DENVER RIO GRANDE DRGW BOX CAR WAGON 315 nd
$67.80
Time Remaining: 2d 22h 3m
Buy It Now for only: $67.80
HAWTHORNE VILLAGE On30 BACHMANN CONFEDERATE CIVIL WAR J E B STUART BOX CAR 005
HAWTHORNE VILLAGE On30 BACHMANN CONFEDERATE CIVIL WAR J E B STUART BOX CAR 005
$59.99
Time Remaining: 3d 13h 49m
Buy It Now for only: $59.99
BINKLEY KIT BUILT HOn3 NARROW GAUGE DSPPRR DENVER SOUTH PARK REEFER BOX CAR 605
BINKLEY KIT BUILT HOn3 NARROW GAUGE DSPPRR DENVER SOUTH PARK REEFER BOX CAR 605
$67.80
Time Remaining: 9d 1h 14m
Buy It Now for only: $67.80
2 On30 Spectrum Colorado  Southern boxcars NIB
2 On30 Spectrum Colorado Southern boxcars NIB
$59.99
Time Remaining: 12d 18h 4m
Buy It Now for only: $59.99
BINKLEY KIT BUILT HOn3 NARROW GAUGE DSPPRR DENVER SOUTH PARK REEFER BOX CAR 606
BINKLEY KIT BUILT HOn3 NARROW GAUGE DSPPRR DENVER SOUTH PARK REEFER BOX CAR 606
$67.80
Time Remaining: 14d 3h 38m
Buy It Now for only: $67.80
BINKLEY KIT BUILT HOn3 NARROW GAUGE DSPPRR DENVER SOUTH PARK REEFER BOX CAR 603
BINKLEY KIT BUILT HOn3 NARROW GAUGE DSPPRR DENVER SOUTH PARK REEFER BOX CAR 603
$67.80
Time Remaining: 15d 6h 20m
Buy It Now for only: $67.80
BINKLEY KIT BUILT HOn3 NARROW GAUGE DENVER RIO GRANDE DRGW BOX CAR WAGON 3145 n
BINKLEY KIT BUILT HOn3 NARROW GAUGE DENVER RIO GRANDE DRGW BOX CAR WAGON 3145 n
$67.80
Time Remaining: 15d 21h 37m
Buy It Now for only: $67.80
On30 Fat Albert Boxcar Conversion to fit Bachmann 18ft flat car
On30 Fat Albert Boxcar Conversion to fit Bachmann 18ft flat car
$37.00
Time Remaining: 22d 7h 50m
Buy It Now for only: $37.00
BACHMANN HAWTHORNE VILLAGE SPIRIT OF AMERICA box car with switch
BACHMANN HAWTHORNE VILLAGE SPIRIT OF AMERICA box car with switch
$39.95
Time Remaining: 26d 16h 16m
Buy It Now for only: $39.95
BACHMANN HAWTHORNE VILLAGE SPIRIT OF AMERICA box car with railroad crossing
BACHMANN HAWTHORNE VILLAGE SPIRIT OF AMERICA box car with railroad crossing
$39.95
Time Remaining: 26d 16h 16m
Buy It Now for only: $39.95
Bachmann On30 Scale Train Box Car Murphy Roof Oxide Red 2 box 26552
Bachmann On30 Scale Train Box Car Murphy Roof Oxide Red 2 box 26552
$89.55
Time Remaining: 29d 10h 54m
Buy It Now for only: $89.55
Bachmann On30 Scale Train 18 Freight Cars Box Car 2 per box 26501
Bachmann On30 Scale Train 18 Freight Cars Box Car 2 per box 26501
$89.55
Time Remaining: 29d 10h 54m
Buy It Now for only: $89.55
Bachmann On30 Scale Train 18 Box Car W Murphy Roof Gray 2 box 26553
Bachmann On30 Scale Train 18 Box Car W Murphy Roof Gray 2 box 26553
$89.55
Time Remaining: 29d 10h 54m
Buy It Now for only: $89.55
Bachmann On30 Scale Train Box Car South Pacific Coast Sunset Logo 27002
Bachmann On30 Scale Train Box Car South Pacific Coast Sunset Logo 27002
$44.40
Time Remaining: 29d 10h 56m
Buy It Now for only: $44.40
Bachmann On30 Scale Train Box Car Mineral Red Data Only 27098
Bachmann On30 Scale Train Box Car Mineral Red Data Only 27098
$44.40
Time Remaining: 29d 10h 56m
Buy It Now for only: $44.40
Bachmann On30 Scale Train Box Car Oxide Red Data Only 27097
Bachmann On30 Scale Train Box Car Oxide Red Data Only 27097
$44.40
Time Remaining: 29d 10h 56m
Buy It Now for only: $44.40
Bachmann On30 Scale Train Box Car White Pass  Yukon 27001
Bachmann On30 Scale Train Box Car White Pass Yukon 27001
$44.40
Time Remaining: 29d 10h 56m
Buy It Now for only: $44.40
ON3 ON30 SILVER CITY MODELS DRGW 1872 12 4 WHEEL BOX CAR KIT
ON3 ON30 SILVER CITY MODELS DRGW 1872 12 4 WHEEL BOX CAR KIT
$36.00
Time Remaining: 29d 13h 15m
Buy It Now for only: $36.00

Other On30 Scale train items recently purchased through this site:

On30 Fat Albert Boxcar Conversion to fit Bachmann 18ft flat car
ON3 ON30 SILVER CITY MODELS DRGW 1872 12 4 WHEEL BOX CAR KIT
2 On30 Spectrum Colorado Southern boxcars NIB
Bachmann On30 Scale Train 18 Freight Cars Box Car 2 per box 26501
HAWTHORNE VILLAGE On30 BACHMANN CONFEDERATE CIVIL WAR J E B STUART BOX CAR 005
Bachmann On30 Scale Train Box Car Mineral Red Data Only 27098
Bachmann On30 Scale Train Box Car Murphy Roof Oxide Red 2 box 26552
Bachmann On30 Scale Train 18 Box Car W Murphy Roof Gray 2 box 26553
Bachmann On30 Scale Train Box Car Oxide Red Data Only 27097
Bachmann On30 Scale Train Box Car White Pass Yukon 27001
Bachmann On30 Scale Train Box Car South Pacific Coast Sunset Logo 27002
BINKLEY KIT BUILT HOn3 NARROW GAUGE DENVER RIO GRANDE DRGW BOX CAR WAGON 315 nd
BINKLEY KIT BUILT HOn3 NARROW GAUGE DSPPRR DENVER SOUTH PARK REEFER BOX CAR 606
BINKLEY KIT BUILT HOn3 NARROW GAUGE DSPPRR DENVER SOUTH PARK REEFER BOX CAR 605
BINKLEY KIT BUILT HOn3 NARROW GAUGE DENVER RIO GRANDE DRGW BOX CAR WAGON 3145 n
BINKLEY KIT BUILT HOn3 NARROW GAUGE DSPPRR DENVER SOUTH PARK REEFER BOX CAR 603
BACHMANN HAWTHORNE VILLAGE SPIRIT OF AMERICA box car with railroad crossing
BACHMANN HAWTHORNE VILLAGE SPIRIT OF AMERICA box car with switch