"Seed inoculant packages are marked with an expiration date. Expired material may not be viable and should not be used. Hot storage conditions will reduce or destroy inoculant viability."

...and this:

Inoculants do require more care than the average chemical or seed treatment product because they contain live bacteria susceptible to environmental conditions during storage. Generally, the following recommendations apply:

* Keep inoculant as cool as possible, 40-77°F.
* Do not expose to heat or direct sunlight.
* Do not store outside or unprotected from elements.
* Do not allow inoculant to freeze and thaw repeatedly.
* Do not allow product to get wet or expose product to extreme humidity.
* Do not use if package seal is broken.
* Do not use after labeled expiration date.
* Destroy unused product after labeled expiration date.
* Product is appropriate for use only on legume seed listed on product label.

You might want to check for an expiration date on the package, just to be sure it's still good.

If the above is true, it might be best to spread the entire fresh purchase of innoculant into the soil asap, rather than store it past its expiration date. The granules might not be the right environment for the bacteria to survive for long, let alone reproduce. Like a carton of eggs in the fridge, they aren't going to hatch in there, or stay fresh forever.