Revell issued a series of three Caterpillar earth moving
vehicles in 1952
[1. p.14 ].
The first of these vehicle I bought in November 2013 was the
Caterpillar Scraper with original box. Originally I did
not plan to make the set complete. The Scraper should serve as
an example of these Revell toys. In September 2014 the Tractor
was offered with a box. Having forgotten I already had a box I
bought the Tractor just for the box, to have an example. The
seller also offered the Grader, though without box. I bought it,
too to make the set complete. Only when digging out the Scraper
for a photo session I noticed that I had it with a box. That is
the way I collect
:-).
Revell issued the set with all three vehicles in one box, too,see.