There are two Mason cards for the MSC Hub.
The 1938 card is:

Delivered To
MSC-Jake Katelman CA
C/O Circle auto Park, 619 Oak St
It only has 500 Chocolate chips on it.
I believe he got the green ones and Herz can not find the card to date.

You should reconize the name. I am infering nothing!

The other card is:
MSC-Muskogee Social Club NY
New York City NY
1930
There is a note on this card written by a Mason employee:
500 choc - sold to Kake Katelman.
IMO this means Mason sold a non-duplicate hot stamp to a 2nd person 8 years after an order.

There are 4 colors on it, no green.

The other mystery on the MSC is the over stamp green ones from the CA illegal boat. I won't mention the name as I will not further what I believe to be a hoax by a seller of chips.