Actually, there's a lot of "varieties" of that basic form of musical wind-instrument reed. They vary slightly in length, shape, and in the way they are attached to the instrument, according to what instrument they are for. (Note the small twin rectangular notches at the base of one of the reeds you found.) Examples of wind-instruments that use this form of reed are Harmonium, Melodeon, Concertina, Accordion, Squeeze-Box, and of course, Pedal Organ. Therefore, it's difficult to say with certainty what instrument those reeds are for, unless you find a photo showing the exact same variation in-place in the instrument.
Here are some photos showing the reeds in a Concertina, and an early-1900s Accordion, and a group which were identified as Harmonium/Melodeon reeds. Note that the ones in this Accordion are double and triple reeds.