Look inside end flap on cardboard , not printed surface , the number is done with a stamp,

only have four of older dark red boxes , three have numbers for 2001 & 2002 , other has none

all new type red boxes have a number stamped inside.

Maybe this only started from about 2000.

Did the new type red box start from 2003 ?

Regards Graham

Hi Ted Roy & Loco Bill , have checked my new trolley 93939 , If you have original box look inside end

flap for number , mine has 070629  which is date backwards 29th June 2007 , this could be last 

factory run , No LGB type sliders .

Regards Graham