Hang the unexpected bud bag in a relatively temperate location, out of the sun, preferably moderate humidity (so it doesn't immediately dry out). Then just hope for the best.
Even well developed tobacco seed is somewhat refractory to germinating during the autumn after it was grown. This winter, sprinkle some of the seed on a paper towel or coffee filter, mist it, and enclose it in a Ziploc bag. Find a 70-80°F place to allow it to try to germinate. Within a week or two of starting that trial, you will know it's approximate germination rate. Might be zero. Might be 95%.
Bob