german notgeld in littleton stamp envelope

I have a little yellow envelope that contains Austrian emergency money.
On the envelope its printed:

Bargain Offer
Genuine Austrian Emergency Money

(it goes on to explain about "Note Money")

at the bottom is the following:

Number:s-1 Bargain price .25
Littleton Stamp CO. :: Littleton, N. H.

inside are three notes
The first is for 80
and has the name scharnstain , the date seems to be march 31 1921

the second note is for 50 , the date seems to be feb. 29 1920

the third is for 10 and has the name micheldorf the date is dec. 31
1920


if any one can give me any information, aprox. value, or suggestions on
how to find out more I'd very much appreciate it.

thank you,