This article is from the Paper Money Collecting FAQ, by Bruce Giese email@example.com with numerous contributions by others.
I can tell you that this note has probably cost more grief, more
wasted postage, phone calls, time and energy than just about any
other reproduction on the market. I'm sorry to disappoint you,
but the Bank of United States $1000 note with serial number 8894
is one of the most copied notes in the world. A method of artificially
creating parchment was discovered back in the early 1960s and one firm
has produced millions of copies of this and other notes, especially
Confederate money. The note has been widely used in advertising
and for several years was used on the boxes that one firm shipped
blank checks in to their customers. The original of this note is
on normal paper, and is in existence, so your copy is worthless.
Every one of them has a story, too. "Found in a trunk that had been
in the family for several generations," is a popular one.