I dont think the Galanthus seeds would be alive this late
I have had fairly good success germinating Galanthus from seed exchanges.
I've had no germination from nivalis and a few unusual ones.
G. reginae-olgae always germinates. I sow them as soon as they arrive,
usually in December, and they germinate the following December, or
occasionally two or three months later than that.
I know the names have changed, and the seeds might not have been correctly
labelled. However, these have germinated in less than a year: caucasicus,
fosteri, and plicatus.
I've sown only one lot of G. gracilis which took 18 months to germinate. (January
to the July after the next).