Discussion Groups / English Usage / January 2004

It certainly isn't a common US term.  I would interpret it as folding
your offer sheet into thirds ((two folds) so that the information is
concealed from casual view.

There is a similar common expression, two-fold, that means the offer
or suggestion has two parts or accomplishes two things.  

In our last episode,
<qI0Rb.47160$T3.651116@news.bora.net>,
the lovely and talented Myeng Jo, Kim
broadcast on alt.usage.english:

"Two-fold" may be the word intended.  If so, the most likely interpretation
in American English would be:

"Your offer must be received in duplicate by the technical department"

which in turn means, you must submit the offer and a copy of the
offer.

"Two-folded" might be a term used in some printing business to describe
a product that is folded twice, such as a brochure or booklet which
might be either accordian folded, letter folded or quarto folded.
This seems unlikely in the context.