Birdsonghill
Crowing
I have been using recycled prescription med bottles for years to store seeds in when they are big enough for the seeds. No problems if kept in a cool dry and dark place. Lettuces, onions and some other seeds are only reliable for one year anyway. I have had bean seeds still germinate after 12 years and I keep more than will fit in a pill bottle typically and use freezer bags for storage for the large seeds kept in bulk.I had not considered that. The plastic ammo box I got smells like plastic, not ammo, but metal ammo boxes have a smell to them as well. I had not considered that the plastic smell would affect the seeds themselves. I mean, some gardeners with serious storage systems use plastic container cases with individual plastic boxes. I don't know if that plastic smells any different that the plastic used in the ammo box I bought.
When I was looking online for seed storage suggestions, I found a number of people with small amounts of seeds like I have, are using these small ammo boxes for storage. Nobody ever mentioned your concern. So, I had not even considered it.
But, if all those people using plastic ammo cans for a number of years don't report any problems, I am thinking it is probably OK for seed storage.